• Achieving High Open-Circuit Voltages up to 1.57 V in Hole-Transport-Material-Free MAPbBr3 Solar Cells with Carbon Electrodes
    by Yongqi Liang, Yajuan Wang, Cheng Mu, Sen Wang, Xinnan Wang, Dongsheng Xu, Licheng Sun on September 25, 2017 at 6:53 am

    An open-circuit voltage (Voc) of 1.57 V under simulated AM1.5 sunlight in planar MAPbBr3 solar cells with carbon (graphite) electrodes is obtained. The hole-transport-material-free MAPbBr3 solar cells with the normal architecture (FTO/TiO2/MAPbBr3/carbon) show little hysteresis during current–voltage sweep under simulated AM1.5 sunlight. A solar-to-electricity power conversion efficiency of 8.70% is achieved with the champion device. Accordingly, it is proposed that the carbon electrodes are effective to extract photogenerated holes in MAPbBr3 solar cells, and the industry-applicable carbon electrodes will not limit the performance of bromide-based perovskite solar cells. Based on the analysis of the band alignment, it is found that the voltage (energy) loss across the interface between MAPbBr3 and carbon is very small compared to the offset between the valence band maximum of MAPbBr3 and the work function of graphite. This finding implies either Fermi level pinning or highly doped region inside MAPbBr3 layer exists. The band-edge electroluminescence spectra of MAPbBr3 from the solar cells further support no back-transfer pathways of electrons across the MAPbBr3/TiO2 interface. An open-circuit voltage (Voc) of 1.57 V under AM1.5 sunlight is obtained in hole-transport-materials-free planar MAPbBr3 solar cells with carbon (graphite) electrodes. Compared to the large band offset between MAPbBr3 and graphite, a small (≤0.43 V) voltage loss across the MAPbBr3/graphite interface is measured. The band-edge electroluminescence from MAPbBr3 devices supports no back transfer of electrons across the MAPbBr3/TiO2 interface. […]

  • Ultrathin high band gap solar cells with improved efficiencies from the world’s oldest photovoltaic material
    on September 25, 2017 at 12:00 am


  • Ultrathin high band gap solar cells with improved efficiencies from the world’s oldest photovoltaic material
    on September 25, 2017 at 12:00 am


  • Approach to high open-circuit voltage polymer solar cells via alcohol/water-soluble cathode interlayer based on anthrathiadiazole derivatives
    by Yang Miao on September 24, 2017 at 11:00 pm

    New J. Chem., 2017, Accepted ManuscriptDOI: 10.1039/C7NJ03061D, PaperYang Miao, Tong Yang, Zong Cheng, Yuewei Zhang, Jingying Zhang, Yue WangTwo small molecular cathode interlayer (CIL) materials with pyridinium ions or quaternary ammonium ions terminated 1,2,3-trihexyloxybenzene as pendant polar groups and the anthrathiadiazole-4,11-dione (ATD) as conjugated backbone, namely PBATD and...The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Simple and low-cost thiophene and benzene-conjugated triaryamines as hole-transporting materials for perovskite solar cells
    by Jianchang Wu on September 24, 2017 at 11:00 pm

    RSC Adv., 2017, 7,45478-45483DOI: 10.1039/C7RA08052B, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Jianchang Wu, Chang Liu, Xiang Deng, Luozheng Zhang, Manman Hu, Jun Tang, Wenchang Tan, Yanqing Tian, Baomin XuTwo novel hole transporting materials were developed, which have comparable performance to that of spiro-OMeTAD but could be of lower cost.The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Design of a Highly Crystalline Low-Band Gap Fused-Ring Electron Acceptor for High-Efficiency Solar Cells with Low Energy Loss
    by Xueliang Shi, Lijian Zuo, Sae Byeok Jo, Ke Gao, Francis Lin, Feng Liu and Alex K.-Y. Jen on September 22, 2017 at 6:33 pm

    Chemistry of MaterialsDOI: 10.1021/acs.chemmater.7b02853 […]

  • Ternary Organic Solar Cells with >11% Efficiency Incorporating Thick Photoactive Layer and Nonfullerene Small Molecule Acceptor
    by Tong Zhang, Xiaoli Zhao, Dalei Yang, Yumeng Tian, Xiaoniu Yang on September 22, 2017 at 3:33 pm

    Currently, constructing ternary organic solar cells (OSCs) and developing nonfullerene small molecule acceptors (n-SMAs) are two pivotal avenues to enhance the device performance. However, introducing n-SMAs into the ternary OSCs to construct thick layer device is still a challenge due to their inferior charge transport property and unclear aggregation mechanism. In this work, a novel wide band gap copolymer 4,8-bis(4,5-dioctylthiophen-2-yl) benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-N-(2-hexyldecyl)-5,5′-bis(thiophen-2-yl)-2,2′-bithiophene-3,3′-dicarboximide (PDOT) is designed and blend of PDOT:PC71BM achieves a power conversion efficiency (PCE) of 9.5% with active layer thickness over 200 nm. The rationally selected n-SMA based on a bulky seven-ring fused core (indacenodithieno[3,2-b]thiophene) end-capped with 2-(3-oxo-2,3-dihydroinden-1-ylidene) malononitrile groups (ITIC) is introduced into the host binary PDOT:PC71BM system to extend the absorption range and reduce the photo energy loss. After fully investigating the morphology evolution of the ternary blends, the different aggregation behavior of n-SMAs with respect to their fullerene counterpart is revealed and the adverse effect of introducing n-SMAs on charge transport is successfully avoided. The ternary OSC delivers a PCE of 11.2% with a 230 nm thick active layer, which is among the highest efficiencies of thick layer OSCs. The results demonstrate the feasibility of using n-SMAs to construct a thick layer ternary device for the first time, which will greatly promote the efficiency of thick layer ternary devices. A ternary organic solar cell with a thick photoactive layer is constructed by introducing a nonfullerene small molecule acceptor into the host binary system based on a novel wide band-gap donor polymer and PC71BM, achieving high Voc of 0.96 V and PCE of 11.2%, which exhibits significant application potential in further roll-to-roll production. […]

  • Highly Reproducible Sn-Based Hybrid Perovskite Solar Cells with 9% Efficiency
    by Shuyan Shao, Jian Liu, Giuseppe Portale, Hong-Hua Fang, Graeme R. Blake, Gert H. ten Brink, L. Jan Anton Koster, Maria Antonietta Loi on September 22, 2017 at 3:32 pm

    The low power conversion efficiency (PCE) of tin-based hybrid perovskite solar cells (HPSCs) is mainly attributed to the high background carrier density due to a high density of intrinsic defects such as Sn vacancies and oxidized species (Sn4+) that characterize Sn-based HPSCs. Herein, this study reports on the successful reduction of the background carrier density by more than one order of magnitude by depositing near-single-crystalline formamidinium tin iodide (FASnI3) films with the orthorhombic a-axis in the out-of-plane direction. Using these highly crystalline films, obtained by mixing a very small amount (0.08 m) of layered (2D) Sn perovskite with 0.92 m (3D) FASnI3, for the first time a PCE as high as 9.0% in a planar p–i–n device structure is achieved. These devices display negligible hysteresis and light soaking, as they benefit from very low trap-assisted recombination, low shunt losses, and more efficient charge collection. This represents a 50% improvement in PCE compared to the best reference cell based on a pure FASnI3 film using SnF2 as a reducing agent. Moreover, the 2D/3D-based HPSCs show considerable improved stability due to the enhanced robustness of the perovskite film compared to the reference cell. An all-tin-based perovskite solar cell with a record power conversion efficiency of 9% is reported for the first time. The outstanding performance is attributed to the fact that the addition of a trace amount of 2D tin perovskite initiates the homogenous growth of highly crystalline and oriented FASnI3 grains at low temperature. […]

  • Charge Transport Modulation of a Flexible Quantum Dot Solar Cell Using a Piezoelectric Effect
    by Yuljae Cho, Paul Giraud, Bo Hou, Young-Woo Lee, John Hong, Sanghyo Lee, Sangyeon Pak, Juwon Lee, Jae Eun Jang, Stephen M. Morris, Jung Inn Sohn, SeungNam Cha, Jong Min Kim on September 22, 2017 at 3:30 pm

    Colloidal quantum dots are promising materials for flexible solar cells, as they have a large absorption coefficient at visible and infrared wavelengths, a band gap that can be tuned across the solar spectrum, and compatibility with solution processing. However, the performance of flexible solar cells can be degraded by the loss of charge carriers due to recombination pathways that exist at a junction interface as well as the strained interface of the semiconducting layers. The modulation of the charge carrier transport by the piezoelectric effect is an effective way of resolving and improving the inherent material and structural defects. By inserting a porous piezoelectric poly(vinylidenefluoride-trifluoroethylene) layer so as to generate a converging electric field, it is possible to modulate the junction properties and consequently enhance the charge carrier behavior at the junction. This study shows that due to a reduction in the recombination and an improvement in the carrier extraction, a 38% increase in the current density along with a concomitant increase of 37% in the power conversion efficiency of flexible quantum dots solar cells can be achieved by modulating the junction properties using the piezoelectric effect. The modulation of the charge carrier transport in flexible quantum dot solar cells is demonstrated by harnessing the piezoelectric potential. Modulation of the junction properties by the piezoelectric potential results in a 37% enhancement in the power conversion efficiency, which is attributed to an efficient dissociation and extraction of the photogenerated charge carriers and a reduction in the nonradiative recombination. […]

  • Donor–Acceptor Type Dopant-Free, Polymeric Hole Transport Material for Planar Perovskite Solar Cells (19.8%)
    by Guan-Woo Kim, Junwoo Lee, Gyeongho Kang, Taewan Kim, Taiho Park on September 22, 2017 at 3:30 pm

    Organic–inorganic hybrid perovskite has led to the development of new solar cells with outstanding efficiency. In perovskite solar cells (PSCs), perovskite is sandwiched between a working electrode (fluorine-doped tin oxide) and a counter electrode (gold, Au). In order to transport charges and block opposite charges, charge transport layers are inserted between perovskite and the electrodes. In particular, a hole transport layer is important because it generally prevents perovskite from exposure to air. Therefore, it is necessary to investigate dopant-free and hydrophobic polymeric hole transport materials (HTMs). In this study, a novel polymeric HTM (PTEG) is synthesized by controlling the solubility using a tetraethylene glycol group. The planar-PSC employing PTEG exhibits an efficiency of 19.8% without any dopants, which corresponds to the highest value reported to date. This study offers a fundamental strategy for designing and synthesizing various polymeric HTMs. This study examines a highly efficient perovskite solar cell (PSC) that employs a dopant-free hole transport material (HTM). A polymeric HTM (PTEG) combined with a tetraethylene glycol group is synthesized and systematically characterized. Results indicate that the PSC employing PTEG exhibits the highest efficiency (19.8%) in the planar device. […]

  • Hysteresis-free perovskite solar cells made of potassium-doped organometal halide perovskite
    on September 22, 2017 at 12:00 am


  • Materials chemistry approaches to the control of the optical features of perovskite solar cells
    by Mauricio E. Calvo on September 21, 2017 at 11:00 pm

    J. Mater. Chem. A, 2017, Advance ArticleDOI: 10.1039/C7TA05666D, Review ArticleMauricio E. CalvoThis work presents a comprehensive revision of the different options developed under the materials chemistry umbrella to control the optical properties of ABX3 solar cells and to endow them with additional functionalities.To cite this article before page numbers are assigned, use the DOI form of citation above.The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Improved performance of hole-transporting layer-free perovskite solar cells by using graphene oxide sheets as the nucleation centers
    by Xue Sun on September 21, 2017 at 11:00 pm

    RSC Adv., 2017, 7,45320-45326DOI: 10.1039/C7RA08680F, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Xue Sun, Tong Lin, Qiaogang Song, Yue Fu, Ye Wang, Fangming Jin, Haifeng Zhao, Wenlian Li, Zisheng Su, Bei ChuGraphene oxide sheets (GOSs) are introduced between indium tin oxide (ITO) and CH3NH3PbI3 in inverted hole-transport layer-free planar heterojunction perovskite solar cells.The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Three-dimensional graphene networks and reduced graphene oxide nanosheets co-modified dye-sensitized solar cells
    by Bo Tang on September 21, 2017 at 11:00 pm

    RSC Adv., 2017, 7,45280-45286DOI: 10.1039/C7RA09135D, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Bo Tang, Guojian Ji, Zhengwei Wang, Haiqun Chen, Xufei Li, Haogang Yu, Sen Li, Hong LiuGraphene assisted dye-sensitized solar cells (DSSCs) have drawn increasing attention because of their high performances.The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Passivation of high aspect ratio silicon nanowires by using catalytic chemical vapor deposition for radial heterojunction solar cell application
    by Gangqiang Dong on September 21, 2017 at 11:00 pm

    RSC Adv., 2017, 7,45101-45106DOI: 10.1039/C7RA08343B, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Gangqiang Dong, Yurong Zhou, Hailong Zhang, Fengzhen Liu, Guangyi Li, Meifang ZhuHigh aspect ratio silicon nanowires (SiNWs) prepared by metal-assisted chemical etching were passivated by using catalytic chemical vapor deposition (Cat-CVD).The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • The electron injection rate in CdSe quantum dots sensitized solar cells: From bifunctional linker and zinc oxide morphology
    by Wei-Lu Ding on September 21, 2017 at 11:00 pm

    Nanoscale, 2017, Accepted ManuscriptDOI: 10.1039/C7NR04847E, PaperWei-Lu Ding, Xing-Liang Peng, Zhu-Zhu Sun, Ze-Sheng LiHerein, we have investigated the effect both of the bifunctional linker (L1, L2, L3, and L4) and ZnO morphology (porous nanoparticles (NPs), nanowires (NWs), and nanotubes (NTs-A and NTs-Z)) on...The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Enhanced Efficiency and Air-stability of NiOX-based Perovskite Solar Cells via PCBM Electron Transport Layer Modification with Triton X-100
    by Kisu Lee on September 21, 2017 at 11:00 pm

    Nanoscale, 2017, Accepted ManuscriptDOI: 10.1039/C7NR05235A, PaperKisu Lee, Jaehoon Ryu, Haejun Yu, Juyoung Yun, Jungsup Lee, Jyongsik JangWe modified phenyl-C61-butyric acid methyl ester (PCBM) for use as a stable, efficient electron transport layer (ETL) in inverted perovskite solar cells (PSCs). PCBM containing a surfactant Triton X-100 acts...The content of this RSS Feed (c) The Royal Society of Chemistry […]

  • Discovery of Pb-Free Perovskite Solar Cells via High-Throughput Simulation on the K Computer
    by Takahito Nakajima and Keisuke Sawada on September 21, 2017 at 8:30 pm

    The Journal of Physical Chemistry LettersDOI: 10.1021/acs.jpclett.7b02203 […]

  • A Facile Two-Step Interface Engineering Strategy To Boost the Efficiency of Inverted Ternary-Blend Polymer Solar Cells over 10%
    by Xiaoxiang Sun, Chang Li, Jian Ni, Like Huang, Rui Xu, Zhenglong Li, Hongkun Cai, Juan Li, Yaofang Zhang and Jianjun Zhang on September 21, 2017 at 3:10 pm

    ACS Sustainable Chemistry & EngineeringDOI: 10.1021/acssuschemeng.7b01792 […]

  • Optoelectronic properties of tungsten-doped indium oxide thin films prepared by polymer-assisted solution processing for use in organic solar cell
    by Sujaya Kumar Vishwanath on September 20, 2017 at 11:00 pm

    J. Mater. Chem. C, 2017, Accepted ManuscriptDOI: 10.1039/C7TC03662K, PaperSujaya Kumar Vishwanath, Taekyu An, Won-Yong Jin, Jae-Wook Kang, Jihoon KimTungsten-doped indium oxide (WIO) transparent conducting thin films, to be used in inverted organic solar cells (IOSCs), were prepared by a polymer-assisted solution (PAS) process. Tungsten has high Lewis acid...The content of this RSS Feed (c) The Royal Society of Chemistry […]

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