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https://www.readbyqxmd.com/read/28335311/a-study-of-inverted-type-perovskite-solar-cells-with-various-composition-ratios-of-fapbi%C3%A2-1-x-mapbbr%C3%A2-x
#1
Lung-Chien Chen, Zong-Liang Tseng, Jun-Kai Huang
This work presents mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite films with various composition ratios, x (x = 0-1), which are formed using the spin coating method. The structural, optical, and electronic behaviors of the mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite films are discussed. A device with structure glass/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/mixed perovskite/C60/BCP/Ag was fabricated. The mixed perovskite film was an active light-harvesting layer. PEDOT: PSS was a hole transporting layer between the ITO and perovskite...
October 13, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334500/efficient-and-stable-vacuum-free-processed-perovskite-solar-cells-enabled-by-a-robust-solution-processed-hole-transport-layer
#2
Chih-Yu Chang, Bo-Chou Tsai, Yu-Cheng Hsiao
In this work, efficient and stable vacuum-free processed perovskite solar cells (PeSCs) is demonstrated by employ solution-processed molybdenum tris-[1-(trifluoroethanoyl)-2-(trifluoromethyl)ethane-1,2-dithiolene] (Mo(tfd-COCF3)3)-doped poly(3,4-ethylenedioxythiophene) (PEDOT) film as hole transport layer (HTL). Our results indicate that the incorporation of Mo(tfd-COCF3)3 dopant can induce p-doping via the charge transfer from the highest occupied molecular orbital level of PEDOT host to the electron affinity of Mo(tfd-COCF3)3, leading to an increase in conductivity by more than three orders of magnitude...
March 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28332402/small-molecule-polymer-composite-hole-transporting-layer-for-highly-efficient-and-stable-perovskite-solar-cells
#3
Jinmiao Wang, Zhao-Kui Wang, Meng Li, Ke-Hao Hu, Yingguo Yang, Yun Hu, Xingyu Gao, Liang-Sheng Liao
Effective and stable hole-transporting materials (HTMs) are necessary for obtaining excellent planar perovskite solar cells (PSCs). Herein, we reported a solution-processed composite HTM consisting of a polymer ploy(3,4-ethylene-dioxythiophene):ploystyrenesulfonate (PEDOT:PSS) and a small molecule copper phthalocyanine-3,4',4'',4'''-tetra-sulfonated acid tetra sodium salt (TS-CuPc) with optimized doping ratios. The composite HTM is crucial on account of not only enhancing the hole transport and extraction, but also improving the perovskite crystallization...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28322051/exploring-the-photovoltaic-performance-of-all-inorganic-ag2pbi4-pbi2-blends
#4
Lyubov A Frolova, Denis V Anokhin, Alexey A Piryazev, Sergey Yurevich Luchkin, Nadezhda N Dremova, Pavel A Troshin
We present all-inorganic photoactive material composed of Ag2PbI4 and PbI2, which shows unexpectedly good photovoltaic performance in planar junction solar cells delivering the external quantum efficiencies of ~60% and light power conversion efficiencies of ~3.9%. The revealed characteristics are among the best reported so far for metal halides with non-perovskite crystal structure. This result highlights a big potential of further exploration of this family of compounds aimed at the development of new generation of materials for efficient and sustainable photovoltaic technologies...
March 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28317983/a-deconvoluted-pl-approach-to-probe-the-charge-carrier-dynamics-of-the-grain-interior-and-grain-boundary-of-a-perovskite-film-for-perovskite-solar-cell-applications
#5
Abdullah Al Mamun, Tanzila Tasnim Ava, Hyeon Jun Jeong, Mun Seok Jeong, Gon Namkoong
We explore a new characterization approach capable of probing the grain interior (GI) and grain boundary (GB) of a CH3NH3PbI3-xClx perovskite thin film. In particular, we have found that the photoluminescence (PL) spectrum observed for a CH3NH3PbI3-xClx perovskite thin film is asymmetric, and can be deconvoluted using a bi-Gaussian function, representing the ordered and disordered phases of the perovskite film. In order to understand the origin of the ordered and disordered phases of the perovskite film, two-dimensional (2D) PL mapping was performed to resolve the PL spectra at the nanoscale level...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28317883/optical-determination-of-shockley-read-hall-and-interface-recombination-currents-in-hybrid-perovskites
#6
Valerio Sarritzu, Nicola Sestu, Daniela Marongiu, Xueqing Chang, Sofia Masi, Aurora Rizzo, Silvia Colella, Francesco Quochi, Michele Saba, Andrea Mura, Giovanni Bongiovanni
Metal-halide perovskite solar cells rival the best inorganic solar cells in power conversion efficiency, providing the outlook for efficient, cheap devices. In order for the technology to mature and approach the ideal Shockley-Queissier efficiency, experimental tools are needed to diagnose what processes limit performances, beyond simply measuring electrical characteristics often affected by parasitic effects and difficult to interpret. Here we study the microscopic origin of recombination currents causing photoconversion losses with an all-optical technique, measuring the electron-hole free energy as a function of the exciting light intensity...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303938/modulated-ch3nh3pbi3-xbrx-film-for-efficient-perovskite-solar-cells-exceeding-18
#7
Yongguang Tu, Jihuai Wu, Zhang Lan, Xin He, Jia Dong, Jinbiao Jia, Panfeng Guo, Jianming Lin, Miaoliang Huang, Yunfang Huang
The organic-inorganic lead halide perovskite layer is a crucial factor for the high performance perovskite solar cell (PSC). We introduce CH3NH3Br in the precursor solution to prepare CH3NH3PbI3-xBrx hybrid perovskite, and an uniform perovskite layer with improved crystallinity and apparent grain contour is obtained, resulting in the significant improvement of photovoltaic performance of PSCs. The effects of CH3NH3Br on the perovskite morphology, crystallinity, absorption property, charge carrier dynamics and device characteristics are discussed, and the improvement of open circuit voltage of the device depended on Br doping is confirmed...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300819/corrigendum-investigation-into-the-advantages-of-pure-perovskite-film-without-pbi2-for-high-performance-solar-cell
#8
Ujwal Thakur, Uisik Kwon, Md Mehedi Hasan, Wenping Yin, Dasom Kim, Na Young Ha, Soonil Lee, Tae Kyu Ahn, Hui Joon Park
No abstract text is available yet for this article.
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299910/amorphous-hole-transporting-material-based-on-2-2-bissubstituted-1-1-biphenyl-scaffold-for-application-in-perovskite-solar-cells
#9
Artiom Magomedov, Nobuya Sakai, Egidijus Kamarauskas, Marius Franckevičius, Gabrielė Jokubauskaitė, Vygintas Jankauskas, Henry J Snaith, Vytautas Getautis
Perovskite solar cells are considered as promising technology for solar energy conversion with the power conversion efficiencies, currently exceeding 20%. In the majority of the record devices Spiro-OMeTAD is used for the positive charge extraction and transport layer. Although, a number of alternative hole transporting materials with different aromatic or heteroaromatic fragments have already been synthesized, a cheap and well performing hole transporting material is still in huge demand. In this work we present two-step synthesis of a novel carbazole-based hole transporting material...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28299829/thermal-induced-crystallization-of-high-quality-ch3nh3pbi3-film-with-large-grains-for-highly-efficient-perovskite-solar-cells
#10
Yu Hou, Shuang Yang, Xiao Chen, Chunzhong Li, Huijun Zhao, Huagui Yang
Recently, fully covered and smooth perovskite films can be fabricated by optimized coating methods, however, it is still hard to prepare perovskite films with large grain size and high crystallinity. Given the fact that thermal energy can promote crystallization, we combine the application of solvent with high boiling point and high temperature crystallization, which produce high quality perovskite films with micrometer sized grains. We further investigated the temperature dependence of the thermal induced synthetic strategy that the grains become larger as the temperature elevated...
March 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28296646/enhanced-electrical-property-of-ni-doped-coox-hole-transport-layer-for-inverted-perovskite-solar-cells
#11
Aibin Huang, Yu Yu, Yan Liu, Songwang Yang, Lei Lei, Shanhu Bao, Xun Cao, Ping Jin
Ultrathin Ni doped CoOx (Ni:CoOx) films were demonstrated by direct current (DC) co-sputtering at room temperature and employed as inorganic hole transport materials for inverted perovskite solar cells. P-type Ni2+ doping introduced in this work was designed to adjust the valence band position of CoOx to match the highest occupied molecular orbital of perovskite absorber material (CH3NH3PbI3), which would effectively inhibit recombination of photo-induced electrons and holes. Moreover, the hole extraction capacity would be further enhanced as a result of the appropriate Ni2+ doping, and hence the power conversion efficiency (PCE) of the devices increased from 3...
March 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28296265/modified-fullerenes-for-efficient-electron-transport-layer-free-perovskite-fullerene-blend-based-solar-cells
#12
Juan L Delgado, Rafael Sandoval-Torrientes, Nazario Martín, Ramón Tena-Zaera, Silvia Collavini, Ivet Kosta, Jorge Pascual, Inés García-Benito
A variety of novel chemically modified fullerenes, showing different electron accepting capabilities, has been synthesized and used to prepare electron transport layer(ETL)-free solar cells based on perovskite:fullerene blends. In particular, isoxazolino[60] fullerenes are proven to be a good candidate for processing blend films with CH3NH3PbI3 and obtaining enhanced power conversion efficiency (PCE) ETL-free perovskite solar cells, improving state-of-the-art PCE (i.e. 14.3%) for this simplified device architecture...
March 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28295695/dual-source-precursor-approach-for-highly-efficient-inverted-planar-heterojunction-perovskite-solar-cells
#13
Deying Luo, Lichen Zhao, Jiang Wu, Qin Hu, Yifei Zhang, Zhaojian Xu, Yi Liu, Tanghao Liu, Ke Chen, Wenqiang Yang, Wei Zhang, Rui Zhu, Qihuang Gong
The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with methylammonium and formamidinium mixed cations. Currently, high-quality mixed-cation perovskite thin films are normally made by use of antisolvent protocols. However, the widely used "antisolvent"-assisted fabrication route suffers from challenges such as poor device reproducibility, toxic and hazardous organic solvent, and incompatibility with scalable fabrication process. Here, a simple dual-source precursor approach is developed to fabricate high-quality and mirror-like mixed-cation perovskite thin films without involving additional antisolvent process...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28292175/determining-band-edge-energies-and-morphology-dependent-stability-of-formamidinium-lead-perovskite-films-using-spectroelectrochemistry-and-photoelectron-spectroscopy
#14
R Clayton Shallcross, Yilong Zheng, S Scott Saavedra, Neal R Armstrong
We show for the first time that the frontier orbital energetics (conduction band minimum (CBM) and valence band maximum (VBM)) of device-relevant, methylammonium bromide (MABr)-doped, formamidinium lead trihalide perovskite (FA-PVSK) thin films can be characterized using UV-Vis spectroelectrochemistry, which provides an additional and straightforward experimental technique for determining energy band values relative to more traditional methods based on photoelectron spectroscopy. FA-PVSK films are processed via a two-step deposition process, known to provide high efficiency solar cells, on semi-transparent indium tin oxide (ITO) and titanium dioxide (TiO2) electrodes...
March 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28291331/enhancing-efficiency-and-stability-of-perovskite-solar-cells-through-nb-doping-of-tio2-at-low-temperature
#15
Guannan Yin, Jiaxin Ma, Hong Jiang, Juan Li, Dong Yang, Fei Gao, Jinghui Zeng, Zhike Liu, Shengzhong Frank Liu
The conduction band energy, conductivity, mobility, and electronic trap states of electron transport layer (ETL) are very important to the efficiency and stability of a planar perovskite solar cell (PSC). However, as the most widely used ETL, TiO2 often needs to be prepared under high temperature and has unfavorable electrical properties such as low conductivity and high electronic trap states. Modifications such as elemental doping are effective methods for improving the electrical properties of TiO2 and the performance of PSCs...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28291270/perovskite-solar-cells-with-a-dmso-treated-pedot-pss-hole-transport-layer-exhibit-higher-photovoltaic-performance-and-enhanced-durability
#16
Di Huang, Tenghooi Goh, Jaemin Kong, Yifan Zheng, Suling Zhao, Zheng Xu, André D Taylor
Despite being the most commonly used hole transport layer for p-i-n perovskite solar cells, the conventional PEDOT:PSS layer is far from being optimal for the best photovoltaic performance. Herein, we demonstrate highly conductive thin DMSO-doped PEDOT:PSS layers which significantly enhance the light harvesting, charge extraction, and photocurrent production of organo-lead iodide devices. Both imaging and X-ray analysis reveal that the perovskite thin films grown on DMSO-doped PEDOT:PSS exhibit larger grains with increased crystallinity...
March 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28287749/boron-doping-of-multi-walled-carbon-nanotubes-significantly-enhances-hole-extraction-in-carbon-based-perovskite-solar-cells
#17
Xiaoli Zheng, Haining Chen, Qiang Li, Yinglong Yang, Zhanhua Wei, Yang Bai, Yongcai Qiu, Dan Zhou, Kam Sing Wong, Shihe Yang
Compared with the conventional perovskite solar cells (PSCs) containing hole-transport materials (HTM), carbon materials based HTM-free PSCs (C-PSCs) have often suffered from inferior power conversion efficiencies (PCEs) arising at least partially from the inefficient hole extraction at perovskite/carbon interface. Here, we show that boron (B) doping of multi-walled carbon nanotubes (B-MWNTs) electrodes are superior in enabling enhanced hole extraction and transport by increasing work function, carrier concentration and conductivity of MWNTs...
March 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28287736/inductive-loop-in-the-impedance-response-of-perovskite-solar-cells-explained-by-surface-polarization-model
#18
Elnaz Ghahremanirad, Agustín Bou, Saeed Olyaee, Juan Bisquert
The analysis of perovskite solar cells by impedance spectroscopy has provided a rich variety of behaviors that demand adequate interpretation. Two main features have been reported: First, different impedance spectral arcs vary in combination; second, inductive loops and negative capacitance characteristics appear as an intrinsic property of the current configuration of perovskite solar cells. Here we adopt a previously developed surface polarization model based on the assumption of large electric and ionic charge accumulation at the external contact interface...
March 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28287555/influence-of-hybrid-perovskite-fabrication-methods-on-film-formation-electronic-structure-and-solar-cell-performance
#19
Tobias Schnier, Jennifer Emara, Selina Olthof, Klaus Meerholz
Hybrid organic/inorganic halide perovskites have lately been a topic of great interest in the field of solar cell applications, with the potential to achieve device efficiencies exceeding other thin film device technologies. Yet, large variations in device efficiency and basic physical properties are reported. This is due to unintentional variations during film processing, which have not been sufficiently investigated so far. We therefore conducted an extensive study of the morphology and electronic structure of a large number of CH3NH3PbI3 perovskite where we show how the preparation method as well as the mixing ratio of educts methylammonium iodide and lead(II) iodide impact properties like film formation, crystal structure, density of states, energy levels, and ultimately the solar cell performance...
February 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28286951/dynamics-of-charged-excitons-and-biexcitons-in-cspbbr3-perovskite-nanocrystals-revealed-by-femtosecond-transient-absorption-and-single-dot-luminescence-spectroscopy
#20
Naoki Yarita, Hirokazu Tahara, Toshiyuki Ihara, Tokuhisa Kawawaki, Ryota Sato, Masaki Saruyama, Toshiharu Teranishi, Yoshihiko Kanemitsu
Metal-halide perovskite nanocrystals (NCs) are promising photonic materials for use in solar cells, light-emitting diodes, and lasers. The optoelectronic properties of these devices are determined by the excitons and exciton complexes confined in their NCs. In this study, we determined the relaxation dynamics of charged excitons and biexcitons in CsPbBr3 NCs using femtosecond transient-absorption (TA), time-resolved photoluminescence (PL), and single-dot second-order photon correlation spectroscopy. Decay times of ~40 and ~200 ps were obtained from the TA and PL decay curves for biexcitons and charged excitons, respectively, in NCs with an average size of 7...
March 13, 2017: Journal of Physical Chemistry Letters
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