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perovskite solar cell

Xiaoqing Jiang, Ze Yu, Yuchen Zhang, Jianbo Lai, Jiajia Li, Gagik G Gurzadyan, Xichuan Yang, Licheng Sun
Herein, we successfully applied a facile in-situ solid-state synthesis of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) as a HTM, directly on top of the perovskite layer, in conventional mesoscopic perovskite solar cells (PSCs) (n-i-p structure). The fabrication of the PEDOT film only involved a very simple in-situ solid-state polymerisation step from a monomer 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) made from a commercially available and cheap starting material. The ultraviolet photoelectron spectroscopy (UPS) demonstrated that the as-prepared PEDOT film possesses the highest occupied molecular orbital (HOMO) energy level of -5...
February 13, 2017: Scientific Reports
Li-Qiang Xie, Liang Chen, Zi-Ang Nan, Hai-Xin Lin, Tan Wang, Dongping Zhan, Jia-Wei Yan, Bing-Wei Mao, Zhong-Qun Tian
The spontaneous α-to-δ phase transition of the Formamidinium-based (FA) lead halide perovskite hinders its large scale application in solar cells. Though this phase transition can be inhibited by alloying with Methylammonium-based (MA) perovskite, the underlying mechanism is largely unexplored. In this communication, we grow high quality mixed cations and halides perovskite single crystals (FAPbI3)1-x(MAPbBr3)x to understand the principles for maintaining pure perovskite phase, which is essential to device optimization...
February 17, 2017: Journal of the American Chemical Society
Haejun Yu, Jaehoon Ryu, Jong Woo Lee, Jongmin Roh, Kisu Lee, Juyoung Yun, Jungsup Lee, Yun Ki Kim, Doyk Hwang, Jooyoun Kang, Seong Keun Kim, Jyongsik Jang
There remains tremendous interest in perovskite solar cells (PSCs) in the solar energy field; the certified power conversion efficiency (PCE) now exceeds 20 %. Along with research focused on enhancing PCE, studies are also underway concerning PSC commercialization. It is crucial to simplify the fabrication process and reduce the production cost to facilitate commercialization. Herein, we successfully fabricated highly efficient hole-blocking layer (HBL)-free PSCs through vigorously interrupting penetration of hole-transport material (HTM) into FTO by large grain based-CH3NH3PbI3 (MAPbI3) film, thereby obtaining a PCE of 18...
February 17, 2017: ACS Applied Materials & Interfaces
Dongsheng Chen, Yanyan Zhu
CH3NH3PbI3 perovskite nanofibers were synthesized by versatile electrospinning techniques. The synthetic CH3NH3PbI3 nanofibers were characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and photoluminescence. As counter electrodes, the synthesized nanofibers increased the performance of the dye-sensitized solar cells from 1.58 to 2.09%. This improvement was attributed to the enhanced smoothness and efficiency of the electron transport path. Thus, CH3NH3PbI3 perovskites nanofibers are potential alternative to platinum counter electrodes in dye-sensitized solar cells...
December 2017: Nanoscale Research Letters
Ze Yu, Xiaoqing Jiang, Jianbo Lai, Yuchen Zhang, Maowei Hu, Ning Lei, Dongping Wang, Xichuan Yang, Licheng Sun
In high-performance perovskite solar cells (PSCs), hole-transporting materials (HTMs) play important roles in extracting and transporting the photo-generated holes from the perovskite absrorber to the cathode, thus reducing unwanted recombination losses and enhancing the photovoltaic performance. Herein, solution-processable tetra-4-(bis(4-tert-butyl)phenyl)amino)phenoxy-substituted copper phthalocyanine (CuPc-OTPAtBu) has been synthesized and explored as a HTM in PSCs. The optical, electrochemical and thermal properties are fully characterized for this organic metal complex...
February 15, 2017: ChemSusChem
Gengwu Ji, Guanhaojie Zheng, Bin Zhao, Fei Song, Xiaonan Zhang, Kongchao Shen, Yingguo Yang, Yimin Xiong, Xingyu Gao, Liang Cao, Dong-Chen Qi
The electronic structures of rubrene films deposited on CH3NH3PbI3 perovskite have been investigated using in situ ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS). It was found that rubrene molecules interacted weakly with the perovskite substrate. Due to charge redistribution at their interface, a downward 'band bending'-like energy shift of ∼0.3 eV and an upward band bending of ∼0.1 eV were identified at the upper rubrene side and the CH3NH3PbI3 substrate side, respectively...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
Wei Chen, Leiming Xu, Xiyuan Feng, Jiansheng Jie, Zhubing He
A series of metal acetylacetonates produced by a full low-temperature (below 100 °C) process are successfully employed to obtain both "multistable" and high-performance planar-inverted perovskite solar cells. All the three kinds of champion cells in small area exhibit over 18% in conversion-efficiency with negligible hysteresis, along with above 16% in conversion-efficiency for planar PSCs in an aperture area of over 1 cm(2) .
February 14, 2017: Advanced Materials
Tsung Yu Hsieh, Chi Kai Huang, Tzu-Sen Su, Cheng-You Hong, Tzu-Chien Wei
Crystal morphology and structure are important for improving the organic-inorganic lead halide perovskite semiconductor property in optoelectronic, electronic and photovoltaic devices. In particular, crystal growth and dissolution are two major phenomena in determining the morphology of methylammonium lead iodide perovskite in the sequential deposition method for fabricating a perovskite solar cell. In this report, the effect of immersion time in the seconds step, i.e. methlyammonium iodide immersion in the morphological, structural, optical and photovoltaic evolution, is extensively investigated...
February 14, 2017: ACS Applied Materials & Interfaces
Sawanta S Mali, Chang Kook Hong, A I Inamdar, Hyunsik Im, Sang Eun Shim
The development of hybrid organo-lead trihalide perovskite solar cells (PSCs) comprising an electron transporting layer (ETL), a perovskite light absorber and a hole transporting layer (HTL) has received significant attention for their potential in efficient PSCs. However, the preparation of a compact and uniform ETL and the formation of a uniform light absorber layer suffer from a high temperature processing treatment and the formation of unwanted perovskite islands, respectively. A low temperature/room temperature processed ETL is one of the best options for the fabrication of flexible PSCs...
February 14, 2017: Nanoscale
Yu Geun Kim, Tae-Yoon Kim, Jeong Hyeon Oh, Kyoung Soon Choi, Youn-Jea Kim, Soo Young Kim
An inorganic lead halide perovskite film, CsPbI3, used as an absorber in perovskite solar cells (PSCs) was optimized by controlling the annealing temperature and the layer thickness. The CsPbI3 layer was synthesized by one-step coating of CsI mixed with PbI2 and a HI additive in N,N-dimethylformamide. The annealing temperature of the CsPbI3 film was varied from 80 to 120 °C for different durations and the thickness was controlled by changing the spin-coating rpm. After annealing the CsPbI3 layer at 100 °C under dark conditions for 10 min, a black phase of CsPbI3 was formed and the band gap was 1...
February 14, 2017: Physical Chemistry Chemical Physics: PCCP
Yaming Yu, Ying Hong, Peng Gao, Mohammad Khaja Nazeeruddin
In the past few years, the advent of lead halide perovskite solar cells (PSCs) has revolutionized the prospects of the third- generation photovoltaics and the reported power conversion efficiency (PCE) has been updated to 22%. Nevertheless, two main challenges, including the poisonous content of Pb and the vexing instability toward water, still lie between the lab-based PSCs technology and large scale commercialization. With this background, we first evaluated Pb(2+) concentration from the rainwater samples polluted by three types of markets promising PSCs with inductively coupled plasma mass spectrometry measurements (ICP-MS) as a case study...
December 20, 2016: Analytical Chemistry
Minghua Li, Xiaoqin Yan, Zhuo Kang, Xinqin Liao, Yong Li, Xin Zheng, Pei Lin, Jingjing Meng, Yue Zhang
The low-cost inorganic-organic lead halide perovskite materials become particularly promising for solar cells with high photovoltaic conversion efficiency. The uniform and pinhole-free perovskite films play an important role for high-performance solar cells. We demonstrate an anti-solvent treatment by controlling the PbI2 morphology to enhance the perovskite conversion and photophysical properties, including high absorption, crystallinity and rapid carrier transfer. The fabricated perovskite solar cells show tremendous PCE improvement to about 16...
February 14, 2017: ACS Applied Materials & Interfaces
Yaowarat Surakhot, Viktor Laszlo, Chirawat Chitpakdee, Vinich Promarak, Taweesak Sudyoadsuk, Nawee Kungwan, Tim Kowalczyk, Stephan Irle, Siriporn Jungsuttiwong
The search for greater efficiency in organic dye-sensitized solar cells (DSCs) and in their perovskite cousins is greatly aided by a more complete understanding of the spectral and morphological properties of the photoactive layer. This investigation resolves a discrepancy in the observed photoconversion efficiency (PCE) of two closely related DSCs based on carbazole-containing D-π-A organic sensitizers. Detailed theoretical characterization of the absorption spectra, dye adsorption on TiO2 , and electronic couplings for charge separation and recombination permit a systematic determination of the origin of the difference in PCE...
February 13, 2017: Journal of Computational Chemistry
Xiang Fang, Jianning Ding, Ningyi Yuan, Peng Sun, Minghang Lv, Guqiao Ding, Chong Zhu
Organic-inorganic halide perovskites have emerged as attractive materials for use in photovoltaic cells. Owing to the existence of dangling bonds at the grain boundaries between perovskite crystals, minimizing the charge recombination at the surface or grain boundaries by passivating these trap states has been identified to be one of the most important strategies for further optimization of device performance. Previous reports have mainly focused on surface passivation by inserting special materials such as graphene or fullerene between the electron transfer layer and the perovskite film...
February 13, 2017: Physical Chemistry Chemical Physics: PCCP
Nir Kedem, Michael Kulbak, Thomas M Brenner, Gary Hodes, David Cahen
Using several metals with different work functions as solar cell back contact we identify majority carrier type inversion in methylammonium lead bromide (MAPbBr3, without intentional doping) as the basis for the formation of a p-n junction. MAPbBr3 films deposited on TiO2 are slightly n-type, whereas in a full device they are strongly p-type. The charge transfer between the metal electrode and the halide perovskite (HaP) film is shown to determine the dominant charge carrier type of the HaP and, thus, also of the final cells...
February 13, 2017: Physical Chemistry Chemical Physics: PCCP
Bert Conings, Simon A Bretschneider, Aslihan Babayigit, Nicolas Gauquelin, Ilaria Cardinaletti, Jean V Manca, Jo Verbeeck, Henry J Snaith, Hans-Gerd Boyen
The power conversion efficiency of halide perovskite solar cells is heavily dependent on the perovskite layer being sufficiently smooth and pinhole-free. It has been shown that these features can be obtained even when starting out from rough and discontinuous perovskite film, by briefly exposing it to methylamine (MA) vapor. The exact underlying physical mechanisms of this phenomenon are, however, still unclear. By investigating smooth, MA treated films, based on very rough and discontinuous reference films of methylammonium triiode (MAPbI3), considering their morphology, crystalline features, local conductive properties, and charge carrier lifetime, we unravel the relation between their characteristic physical qualities and their performance in corresponding solar cells...
February 10, 2017: ACS Applied Materials & Interfaces
Xing Zhao, Hui-Seon Kim, Ja-Young Seo, Nam-Gyu Park
Thermal stability of CH3NH3PbI3 (MAPbI3)-based perovskite solar cells was investigated for the normal structure including mesoporous TiO2 layer and spiro-MeOTAD and the invert structure with PCBM and NiO. MAPbI3 was found to be intrinsically stable from 85 oC up to 120 oC in the absence of moisture. However, fast degradation was observed for the encapsulated device including spiro-MeOTAD upon thermal stress at 85 oC. Photoluminescence (PL) intensity and time constant for charge separation increased with thermal exposure time, which is indicative of inhibition of charge separation from MAPbI3 into spiro-MeOTAD...
February 10, 2017: ACS Applied Materials & Interfaces
Taketo Handa, David M Tex, Ai Shimazaki, Atsushi Wakamiya, Yoshihiko Kanemitsu
Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multi-layered structures, the device performance is determined by complicated carrier dynamics. Here, we studied photocarrier recombination and injection dynamics in CH3NH3PbI3 perovskite solar cells using time-resolved photoluminescence (PL) and photocurrent (PC) measurements. It is found that a peculiar slowdown in the PL decay time constants of the perovskite layer occurs for higher excitation powers, followed by a decrease of the external quantum efficiency for PC...
February 10, 2017: Journal of Physical Chemistry Letters
Linna Zhu, Yahan Shan, Rui Wang, Debei Liu, Cheng Zhong, Qunliang Song, Fei Wu
In this work, four tetraphenylethylene (TPE) centered hole transport materials (HTMs), with 2,7- or 3,6-substituted carbazole derivatives as periphery groups are deliberately synthesized and characterized. Their photophysical properties, energy levels and photovoltaic performances are systematically investigated, and their performances as HTMs are discussed with respect to the different substituent positions on carbazole moiety. It is interesting to find that the TPE-based HTMs with 2,7-carbazole substituents rival the 3,6-carbazole substituents in hole mobility and hole extraction ability...
February 8, 2017: Chemistry: a European Journal
Jeremy Barbe, Max L Tietze, Marios Neophytou, Banavoth Murali, Erkki Alarousu, Abdulrahman El Labban, Mutalifu Abulikemu, Wan Yue, Omar F Mohammed, Iain McCulloch, Aram Amassian, Silvano Del Gobbo
The chemical bath deposition of tin oxide (SnO2) thin films as electron transporting layer (ETL) in planar heterojunction n-i-p organohalide lead perovskite and organic bulk heterojunction solar cells is reported. The amorphous SnO2 films are grown from a non-toxic aqueous bath of tin chloride at very low temperatures (55°C) and do not require post-annealing treatment to work very effectively as ETL in planar heterojunction n-i-p organohalide lead perovskite or organic bulk heterojunction solar cells, in lieu of the commonly used ETL materials TiO2 and ZnO, respectively...
February 8, 2017: ACS Applied Materials & Interfaces
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