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Perovskite solar cells

Tao Ye, Xi Jiang, Dongyang Wan, Xingzhi Wang, Jun Xing, Thirumalai Venkatesan, Qihua Xiong, Seeram Ramakrishna
Aligned and flexible electrospun carbon nanomaterials are used to synthesize novel carbon perovskite nanocomposite for the first time. The free electron diffusion length in CH3NH3PbI3 phase of the CH3NH3PbI3/carbon nanocomposite is observed to almost double that of bare CH3NH3PbI3 and nearly 95% of the photogenerated free holes can inject from CH3NH3PbI3 phase to the carbon nanomaterials. Furthermore, the exciton binding energy in the composite is estimated to be ~23 meV by utilizing temperature dependent optical absorption spectroscopy...
October 22, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
P S Whitfield, N Herron, W E Guise, K Page, Y Q Cheng, I Milas, M K Crawford
We have examined the crystal structures and structural phase transitions of the deuterated, partially deuterated and hydrogenous organic-inorganic hybrid perovskite methyl ammonium lead iodide (MAPbI3) using time-of-flight neutron and synchrotron X-ray powder diffraction. Near 330 K the high temperature cubic phases transformed to a body-centered tetragonal phase. The variation of the order parameter Q for this transition scaled with temperature T as Q ∼ (Tc-T)(β), where Tc is the critical temperature and the exponent β was close to ¼, as predicted for a tricritical phase transition...
October 21, 2016: Scientific Reports
Cheng-Bo Tian, Edison Castro, Tan Wang, German Betancourt, Gloria Rodriguez, Luis A Echegoyen
Inverted planar structure perovskite solar cells (PSCs), due to their low temperature precessing and lack of hysteretic problems, are attracting increased attention by researchers around the world. Fullerene derivatives are the most widely used electron transport materials (ETM) in inverted planar perovskite solar cells, especially [6,6]-phenyl-C61-butyric acid methylester (PC61BM), which exhibits very good performance. However, to the best of our knowledge, the influence of the adducts on the fullerene-based PSCs performance has not been fully explored to date...
October 21, 2016: ACS Applied Materials & Interfaces
Ashish Dubey, Nirmal Adhikari, Swaminathan Venkatesan, Shaopeng Gu, Devendra Khatiwada, Qi Wang, Lal Mohammad, Mukesh Kumar, Qiquan Qiao
This data in brief includes forward and reverse scanned current density-voltage (J-V) characteristics of perovskite solar cells with PDPP3T and spiro-OMeTAD as HTL, stability testing conditions of perovskite solar cell shelf life in air for both PDPP3T and spiro-OMeTAD as HTL as per the description in Ref. [1], and individual J-V performance parameters acquired with increasing time exposed in ambient air are shown for both type of devices using PDPP3T and spiro-OMeTAD as HTL. The data collected in this study compares the device stability with time for both PDPP3T and spiro-OMeTAD based perovskite solar cells and is directly related to our research article "solution processed pristine PDPP3T polymer as hole transport layer for efficient perovskite solar cells with slower degradation" [2]...
June 2016: Data in Brief
Pengwei Li, Chao Liang, Yiqiang Zhang, Fengyu Li, Yanlin Song, Guosheng Shao
The interfacial contact is critical for the performance of perovskite solar cells (PSCs), leading to dense perovskite thin films and efficient charge transport. In this contribution, an effective interfacial treatment solution using polyethyleneimine (PEI) was developed to improve the performance and stability of PSCs. Inserting PEI between s-VOX and perovskite layer can produce a high-energy hydrophilic surface to facilitate the formation of high-quality perovskite layer by solution method. Accordingly, the surface coverage of perovskite film on s-VOX layer increased from 80% to 95%, and PCE of the device improved from 12...
October 19, 2016: ACS Applied Materials & Interfaces
Lyubov A Frolova, Denis V Anokhin, Kirill L Gerasimov, Nadezhda N Dremova, Pavel A Troshin
Here we report a systematic study of the Pb(2+) substitution in the hybrid iodoplumbate MAPbI3 with a series of elements affecting optoelectronic, structural and morphological properties of the system. It has been shown that even partial replacement of lead with Cd(2+), Zn(2+), Fe(2+), Ni(2+), Co(2+), In(3+), Bi(3+), Sn(4+), and Ti(4+) results in a significant deterioration of the photovoltaic characteristics. On the contrary, Hg-containing hybrid MAPb1-xHgxI3 salts demonstrated a considerably improved solar cell performance at optimal mercury loading...
October 19, 2016: Journal of Physical Chemistry Letters
Chih-Ming Chen, Zheng-Kun Lin, Wei-Jie Huang, Sheng-Hsiung Yang
In this work, we demonstrate a novel carrier transporting combination made of tungsten trioxide (WO3) nanomaterials and Cs2CO3/PCBM buffer bilayer for the fabrication of perovskite solar cells (PSCs). Two different types of WO3, including nanoparticles and nanorods, were prepared by sol-gel process and hydrothermal method, respectively. Cs2CO3/PCBM buffer bilayer was inserted between WO3 and perovskite layers to improve charge transfer efficiency and formation of pinhole-free perovskite layer. Besides, the leakage current of the devices containing Cs2CO3/PCBM buffer bilayer was significantly suppressed...
December 2016: Nanoscale Research Letters
Chong Liu, Jiandong Fan, Hongliang Li, Cuiling Zhang, Yaohua Mai
Despite organometal halide perovskite solar cells have recently exhibited a significant leap in efficiency, the Sn-based perovskite solar cells still suffer from low efficiency. Here, a series homogeneous CH3NH3Pb(1-x)SnxI3 (0 ≤ x ≤ 1) perovskite thin films with full coverage were obtained via solvent engineering. In particular, the intermediate complexes of PbI2/(SnI2)∙(DMSO)x were proved to retard the crystallization of CH3NH3SnI3, thus allowing the realization of high quality Sn-introduced perovskite thin films...
October 18, 2016: Scientific Reports
Lin Ma, Feng Hao, Constantinos C Stoumpos, Brian T Phelan, Michael R Wasielewski, Mercouri G Kanatzidis
The dynamics of photoexcited lead-free perovskite films, CH3NH3SnI3, were studied using broadband transient absorption (TA) and time-resolved fluorescence (TRF) spectroscopy. Similar to its lead analogue CH3NH3PbI3, we show that free carrier (electrons and holes) recombination is also the dominant relaxation pathway in CH3NH3SnI3 films. The slow hot carrier relaxation time is 0.5 ps. Long carrier diffusion lengths for electrons (279 ± 88 nm) and holes (193 ± 46 nm) were obtained from fluorescence quenching measurements...
October 17, 2016: Journal of the American Chemical Society
Giles E Eperon, David Moerman, David S Ginger
We use high-resolution, spatially resolved, laser beam induced current, confocal photoluminescence, and photoconductive atomic force microscopy (pcAFM) measurements to correlate local solar cell performance with spatially heterogeneous local material properties in methylammonium lead triiodide (CH3NH3PbI3) perovskite solar cells. We find that, for this material and device architecture, the photocurrent heterogeneity measured via pcAFM on devices missing a top selective contact with traditional Au-coated tips is significantly larger than the photocurrent heterogeneity observed in full devices with both electron- and hole-selective extraction layers, indicating that extraction barriers at the Au/perovskite interface are ameliorated by deposition of the organic charge extraction layer...
October 17, 2016: ACS Nano
Ke Chen, Qin Hu, Tanghao Liu, Lichen Zhao, Deying Luo, Jiang Wu, Yifei Zhang, Wei Zhang, Feng Liu, Thomas P Russell, Rui Zhu, Qihuang Gong
The charge-carrier balance strategy by interface engineering is employed to optimize the charge-carrier transport in inverted planar heterojunction perovskite solar cells. N,N-Dimethylformamide-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and poly(methyl methacrylate)-modified PCBM are utilized as the hole and electron selective contacts, respectively, leading to a high power conversion efficiency of 18.72%.
October 17, 2016: Advanced Materials
Bert Conings, Aslihan Babayigit, Matthew T Klug, Sai Bai, Nicolas Gauquelin, Nobuya Sakai, Jacob Tse-Wei Wang, Johan Verbeeck, Hans-Gerd Boyen, Henry J Snaith
A robust and expedient gas quenching method is developed for the solution deposition of hybrid perovskite thin films. The method offers a reliable standard practice for the fabrication of a non-exhaustive variety of perovskites exhibiting excellent film morphology and commensurate high performance in both regular and inverted structured solar cell architectures.
October 17, 2016: Advanced Materials
Laura Calió, Samrana Kazim, Michael Grätzel, Shahzada Ahmad
The pressure to move towards renewable energy has inspired researchers to look for ideas in photovoltaics that may lead to a major breakthrough. Recently the use of perovskites as a light harvester has lead to stunning progress. The power conversion efficiency of perovskite solar cells is now approaching parity (>22 %) with that of the established technology which took decades to reach this level of performance. The use of a hole transport material (HTM) remains indispensable in perovskite solar cells...
October 14, 2016: Angewandte Chemie
Xiaowen Chang, Weiping Li, Haining Chen, Liqun Zhu, Huicong Liu, Huifang Geng, Sisi Xiang, Jiaming Liu, Xiaoli Zheng, Ying-Long Yang, Shihe Yang
Carbon-based hole transport materials (HTM)-free perovskite solar cells (PSCs) due to their relatively high stability have attracted intense attention. However, their power conversion efficiency (PCE) is still low, especially for the simplest paintable carbon-based PSCs (C-PSCs), whose performance is greatly limited by the poor contact at perovskite/carbon interface. To enhance interface contact, it is important to fabricate an even-surface perovskite layer in porous scaffold, which is usually unfeasible due to rough crystal precursor...
October 14, 2016: ACS Applied Materials & Interfaces
Wenzhe Li, Jiandong Fan, Jiangwei Li, Guangda Niu, Yaohua Mai, Liduo Wang
Currently, the potential mechanism of the solvent-assisted crystallization for mixed cations perovskite thin film (FAxMA1-xPbI3) prepared via two-step solution-process still remains obscure. Here, we clarified the molecular-competing-reacted process of NH2CH=NH2I (FAI) and CH3NH3I (MAI) with PbI2(DMSO)x complex in dimethyl sulfoxide (DMSO) and diethyl ether (DE) catalytic solvent system in the sequential two-step solution-process. The microscopic dynamics was characterized via the characterizations of in-situ photoluminescence (PL) spectra...
October 14, 2016: ACS Applied Materials & Interfaces
Xiong Yin, Zhongzhong Xu, Yanjun Guo, Peng Xu, Meng He
Perovskite solar cells, which utilize organometal-halide perovskites as light harvesting materials, have attracted great attention due to their high power conversion efficiency (PCE) and potentially low cost in fabrication. A compact layer of TiO2 or ZnO is generally applied as electron-transport layer (ETL) in a typical perovskite solar cell. In this study, we explored ternary oxides in TiO2-ZnO system to find new materials for the ETL. Compact layers of titanium zinc oxides were readily prepared on the conducting substrate via spray pyrolysis method...
October 14, 2016: ACS Applied Materials & Interfaces
Xiaofei Zhao, Baohua Zhang, Ruyan Zhao, Bing Yao, Xuejing Liu, Jun Liu, Zhiyuan Xie
Organometal halide perovskites (OHPs) are becoming a hot topic in the field of display and lighting. Unlike strategy used for solar cells, i.e. using several hundred nanometer thick OHP film for fully absorbing solar light to convert electricity, thin film OHPs (less than 50 nm) are advantageous to restrain its self-absorption drawback and thus beneficial for preparing efficient light-emitting diodes (LEDs). Here, we manipulate the excess molar ratio of MABr:PbBr2 precursors and the post annealing temperature to obtain uniform thin film OHPs and suppress the nonradiative defects...
October 13, 2016: Journal of Physical Chemistry Letters
Hongseuk Lee, Areum Kim, Hyeok-Chan Kwon, Wooseok Yang, Yunjung Oh, Daehee Lee, Jooho Moon
We demonstrated crystallization retardation of CH3NH3PbI3 thin film during single-coating of presursor solution by simple addition of NaCl. NaCl was co-dissolved into a precursor mixture solution containing PbI2 and methylammonium iodide (MAI). Dissolved NaCl interacted with the PbI2 in solution and produced a stable intermediate phase, which was converted to a full-coverage uniform perovskite absorber layer via reaction with MAI during a single spin coating. The resulting planar-structure perovskite solar cell made from NaCl-supplemented precursor solution showed a 48% improvement in power conversion efficiency (PCE) (maximum value 15...
October 12, 2016: ACS Applied Materials & Interfaces
Shi Wun Tong, Janardhan Balapanuru, Deyi Fu, Kian Ping Loh
In the short time since its discovery, perovskite solar cells (PSCs) have attained high power conversion efficiency but their lack of thermal stability remains a barrier to commercialization. Among the experimentally accessible parameter space for optimizing performance, identifying an electron transport layer (ETL) that forms a thermally stable interface with perovskite and which is solution-processible at low-temperature will certainly be advantageous. Herein, we developed a mesoporous graphene/polymer composite with these advantages when used as ETL in CH3NH3PbI3 PSCs, and a high efficiency of 13...
October 12, 2016: ACS Applied Materials & Interfaces
Shanming Ke, Chang Chen, Nian-Qing Fu, Hua Zhou, Mao Ye, Peng Lin, Wen-Xiang Yuan, Xierong Zeng, Lang Chen, Haitao Huang
Sn-doped In2O3 (ITO) electrodes were deposited on transparent and flexible muscovite mica. The use of mica substrate makes a high-temperature annealing process (up to 500 °C) possible. ITO/mica retains its low electric resistivity even after continuous bending of 1000 times on account of the unique layered structure of mica. When used as a transparent flexible heater, ITO/mica shows an extremely fast ramping (< 15 s) up to a high temperature of over 438 °C. When used as a transparent electrode, ITO/mica permits a high temperature annealing (450 °C) approach to fabricate flexible perovskite solar cells (PSCs) with high efficiency...
October 11, 2016: ACS Applied Materials & Interfaces
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