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perovskite solar cell

Yongzhen Wu, Fengxian Xie, Han Chen, Xudong Yang, Huimin Su, Molang Cai, Zhongmin Zhou, Takeshi Noda, Liyuan Han
Solution-processed perovskite (PSC) solar cells have achieved extremely high power conversion efficiencies (PCEs) over 20%, but practical application of this photovoltaic technology requires further advancements on both long-term stability and large-area device demonstration. Here, an additive-engineering strategy is developed to realize a facile and convenient fabrication method of large-area uniform perovskite films composed of large crystal size and low density of defects. The high crystalline quality of the perovskite is found to simultaneously enhance the PCE and the durability of PSCs...
May 19, 2017: Advanced Materials
Barry McKenna, Rachel C Evans
Single-junction photovoltaic devices exhibit a bottleneck in their efficiency due to incomplete or inefficient harvesting of photons in the low- or high-energy regions of the solar spectrum. Spectral converters can be used to convert solar photons into energies that are more effectively captured by the photovoltaic device through a photoluminescence process. Here, recent advances in the fields of luminescent solar concentration, luminescent downshifting, and upconversion are discussed. The focus is specifically on the role that materials science has to play in overcoming barriers in the optical performance in all spectral converters and on their successful integration with both established (e...
May 19, 2017: Advanced Materials
Jie Ma, Lin-Wang Wang
CH3NH3PbI3 is one of the most promising candidates for cheap and high-efficiency solar cells. One of its unique features is the long carrier diffusion length (> 100 μm), but its carrier mobility is rather modest. The nature of the mobility is unclear. Here, using non-adiabatic wave function dynamics simulations, we show that the random rotations of the CH3NH3 cations play an important role in the carrier mobility. Our previous work showed that the electron and hole wave functions were localized and spatially separated due to the random orientations of the CH3NH3 cations in the tetragonal phase...
May 18, 2017: Nano Letters
Xiaoyuan Liu, Xiaolu Zheng, Yulong Wang, Zhiliang Chen, Fang Yao, Qi Zhang, Guojia Fang, Zhi-Kuan Chen, Wei Huang, ZongXiang Xu
Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high performance perovskite solar cells (PSCs). The highest efficiency PSCs use organic HTMs, many of which have low mobilities and so require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two novel HTMs (IDT-TPA and IDTT-TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron donating methoxytriphenylamine (TPA) groups as the end-capping units...
May 18, 2017: ChemSusChem
Longbin Qiu, Luis K Ono, Yan Jiang, Matthew R Leyden, Sonia R Raga, Shenghao Wang, Yabing Qi
The rapid rise of power conversion efficiency (PCE) of low cost organometal halide perovskite solar cells suggests that these cells are a promising alternative to conventional photovoltaic technology. However, anomalous hysteresis and unsatisfactory stability hinder the industrialization of perovskite solar cells. Interface engineering is of importance for the fabrication of highly stable and hysteresis free perovskite solar cells. Here we report that a surface modification of the widely used TiO2 compact layer can give insight into interface interaction in perovskite solar cells...
May 17, 2017: Journal of Physical Chemistry. B
Mingming Chen, Xin Shan, Thomas Geske, Junqiang Li, Zhibin Yu
Ion migration has been commonly observed as a detrimental phenomenon in organometal halide perovskite semiconductors, causing the measurement hysteresis in solar cells and ultra-short operation lifetimes in light-emitting diodes. In this work, ion migration is utilized for the formation of a p-i-n junction at ambient temperature in single-crystalline organometal halide perovskites. The junction is subsequently stabilized by quenching the ionic movement at a low temperature. Such a strategy of manipulating the ion migration has led to efficient single-crystalline light-emitting diodes that emit 2...
May 17, 2017: ACS Nano
Yahui Li, Zhenhao Zhao, Feng Lin, Xiaobing Cao, Xian Cui, Jinquan Wei
It is of great importance to investigate the crystallization of organometallic perovskite from solution for enhancing performance of perovskite solar cells. Here, this study develops a facile method for in situ observation of crystallization and growth of the methylammonium lead iodide (MAPbI3 ) perovskite from microdroplets ejected by an alternating viscous and inertial force jetting method. It is found that there are two crystallization modes when MAPbI3 grows from the CH3 NH3 I (MAI)/PbI2 /N,N-dimethylformamide (DMF) solution: needle precursors and granular perovskites...
May 17, 2017: Small
Andreas Kaltzoglou, Constantinos C Stoumpos, Athanassios G Kontos, Georgios K Manolis, Kyriakos Papadopoulos, Kyriaki G Papadokostaki, Vasilis Psycharis, Chiu C Tang, Young-Kwang Jung, Aron Walsh, Mercouri G Kanatzidis, Polycarpos Falaras
We report on the synthesis, characterization, and optoelectronic properties of the novel trimethylsulfonium lead triiodide perovskite, (CH3)3SPbI3. At room temperature, the air-stable compound adopts a hexagonal crystal structure with a 1D network of face-sharing [PbI6] octahedra along the c axis. UV-vis reflectance spectroscopy on a pressed pellet revealed a band gap of 3.1 eV, in agreement with first-principles calculations, which show a small separation between direct and indirect band gaps. Electrical resistivity measurements on single crystals indicated that the compound behaves as a semiconductor...
May 16, 2017: Inorganic Chemistry
Wangen Zhao, Dong Yang, Shengzhong Frank Liu
Organic-inorganic hybrid perovskite as a kind of promising photovoltaic material is booming due to its low-cost, high defect tolerance, and easy fabrication, which result in the huge potential in industrial production. In the pursuit of high efficiency photovoltaic devices, high-quality absorbing layer is essential. Therefore, developing organic-inorganic hybrid perovskite thin films with good coverage, improved uniformity, and crystalline in a single pass deposition is of great concern in realizing good performance of perovskite thin-film solar cell...
May 16, 2017: Small
Minjin Kim, Gi-Hwan Kim, Kyoung Suk Oh, Yimhyun Jo, Hyun Yoon, Ka-Hyun Kim, Heon Lee, Jin Young Kim, Dong Suk Kim
Organic-inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the last decade, their practical transition to large-size devices have been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large-size grain domains of perovskite films over large areas...
May 15, 2017: ACS Nano
Xia-Li Ou, Jing Feng, Ming Xu, Hong-Bo Sun
We have fabricated semitransparent and flexible indium-free perovskite solar cells (PeSCs) with high visible transmittance employing two kinds of composite ultrathin metallic electrodes, MoO<sub>3</sub>/Au and MoO<sub>3</sub>/Au/Ag/MoO<sub>3</sub>/Alq<sub>3</sub>, as the bottom and top electrodes, respectively. These electrodes show superb electrical conductivity, excellent mechanical robustness, and high optical transparency which are quite suitable for semitransparent and flexible PeSCs...
May 15, 2017: Optics Letters
Senyun Ye, Haixia Rao, Ziran Zhao, Linjuan Zhang, Hongliang Bao, Weihai Sun, Yunlong Li, Feidan Gu, Jianqiang Wang, Zhiwei Liu, Zuqiang Bian, Chunhui Huang
It is extremely significant to study the trap state passivation and minimize the trap states of perovskite to achieve high-performance perovskite solar cells (PSCs). Here, we have first revealed and demonstrated that a novel p-type conductor Cu(Thiourea)I (Cu(Tu)I) incorporated in perovskite layer can effectively passivate the trap states of perovskite via interacting with the under-coordinated metal cations and halide anions at perovskite crystal surface. The trap state energy level of perovskite can be shallowed from 0...
May 14, 2017: Journal of the American Chemical Society
Xianqiang Li, Xiaohong Tang, Tao Ye, Dan Wu, Hong Wang, Xizu Wang
The perovskite solar cells (PSCs) and organic solar cells (OSCs) with high performance were fabricated with transfer-printed top metal electrodes. We have demonstrated that PSCs and OSCs with the top Au electrodes fabricated by using the transfer printing method have comparable or better performance than the devices with the top Au electrodes fabricated by using conventional thermal evaporation method. The highest PCE of the PSCs and OSCs with the top electrodes fabricated using the transfer printing method achieved 13...
May 15, 2017: ACS Applied Materials & Interfaces
William L Hoffeditz, Michael J Pellin, Omar K Farha, Joseph T Hupp
Often key to boosting photovoltages in photoelectrochemical and related solar-energy-conversion devices is the preferential slowing of rates of charge recombination - especially recombination at semiconductor/solution, semiconductor/polymer, or semiconductor/perovskite interfaces. In devices featuring TiO2 as the semiconducting component, a common approach to slowing recombination is to install an ultrathin metal-oxide barrier layer or trap-passivating layer atop the semiconductor, with the needed layer often being formed via atomic layer deposition (ALD)...
May 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Dong Hun Sin, Sae Byeok Jo, Seung Goo Lee, Hyomin Ko, Min Kim, Hansol Lee, Kilwon Cho
A mechanically and thermally stable and electron-selective ZnO/CH3NH3PbI3 interface is created via hybridization of a polar insulating polymer, poly(ethylene glycol) (PEG), into ZnO nanoparticles (NPs). PEG successfully passivates the oxygen defects on ZnO and prevents direct contact between CH3NH3PbI3 and defects on ZnO. A uniform CH3NH3PbI3 film is formed on a soft ZnO:PEG layer after dispersion of the residual stress from the volume expansion during CH3NH3PbI3 conversion. PEG also increases the work of adhesion of the CH3NH3PbI3 film on the ZnO:PEG layer and holds the CH3NH3PbI3 film with hydrogen bonding...
May 19, 2017: ACS Applied Materials & Interfaces
Yangyang Du, Hongkun Cai, Yunhao Wu, Zhixue Xing, Zhenglong Li, Jian Xu, Like Huang, Jian Ni, Juan Li, Jianjun Zhang
In this work, the influence of oxygen vacancy defect (OVD) in compact titanium oxide (c-TiO2) on the performance of planar perovskite solar cells (p-PSCs) is investigated, and the possible mechanisms are also proposed. To meet our objective, anatase c-TiO2 thin films with various OVD concentrations are prepared by changing the oxygen flux during the DC magnetron sputtering process and are characterized by the intensity of defect signals in the X-ray photoelectron spectra. We conclude that abundant OVDs can trigger an obviously increased majority carrier accumulation zone at the metal oxide/perovskite interface and enhanced capacitance, thereby greatly deteriorating photogenerated carrier collection efficiency...
May 12, 2017: Physical Chemistry Chemical Physics: PCCP
Miguel Anaya, Wei Zhang, Bruno Clasen Hames, Yuelong Li, Francisco Fabregat-Santiago, Mauricio E Calvo, Henry J Snaith, Hernán Míguez, Iván Mora-Seró
In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific scaffold layer, are not yet fully understood. Increasingly complex scaffolds attained by the sequential deposition of TiO2 and SiO2 mesoporous layers onto transparent conducting substrates are used to perform a systematic characterization of both the injection process at the electron selective contact and the scaffold effect in PSCs...
January 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
Youhei Numata, Atsushi Kogo, Yosuke Udagawa, Hideyuki Kunugita, Kazuhiro Ema, Yoshitaka Sanehira, Tsutomu Miyasaka
We developed new and simple solvent vapor-assisted thermal annealing (VA) procedure, which can reduce grain boundaries in a perovskite film, for fabricating highly efficient perovskite solar cells (PSCs). By recycle of solvent molecules evaporated from an as-prepared perovskite film as a VA vapor source, named as pot-roast VA (PR-VA) method, finely controlled and reproducible device fabrication was achieved for formamidinium (FA) and methylammonium (MA) mixed cation halide perovskite, (FAPbI<sub>3</sub>)<sub>0...
May 11, 2017: ACS Applied Materials & Interfaces
Nicholas Aristidou, Christopher Eames, Irene Sanchez-Molina, Xiangnan Bu, Jan Kosco, M Saiful Islam, Saif A Haque
Methylammonium lead halide perovskites are attracting intense interest as promising materials for next-generation solar cells, but serious issues related to long-term stability need to be addressed. Perovskite films based on CH3NH3PbI3 undergo rapid degradation when exposed to oxygen and light. Here, we report mechanistic insights into this oxygen-induced photodegradation from a range of experimental and computational techniques. We find fast oxygen diffusion into CH3NH3PbI3 films is accompanied by photo-induced formation of highly reactive superoxide species...
May 11, 2017: Nature Communications
Ik Jae Park, Gyeongho Kang, Min Ah Park, Ju Seong Kim, Se Won Seo, Dong Hoe Kim, Kai Zhu, Taiho Park, Jin Young Kim
Given that the highest certified conversion efficiency of the organic-inorganic perovskite solar cell (PSC) is already over 22%, which is even higher than that of the polycrystalline silicon solar cell, the significance of new scalable processes that can be utilized for preparing large-area devices and their commercialization is rapidly increasing. From this perspective, the electrodeposition method is one of the mostly suitable processes for preparing large-area devices, because it is an already commercialized process with proven controllability and scalability...
May 10, 2017: ChemSusChem
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