scholarly journals The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Aurelien M. A. Leguy ◽  
Jarvist Moore Frost ◽  
Andrew P. McMahon ◽  
Victoria Garcia Sakai ◽  
W. Kockelmann ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Time Window ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
High Efficiency Solar Cells ◽  
Scattering Measurements ◽  
Quasielastic Neutron ◽  
Methylammonium Lead Iodide

Abstract Methylammonium lead iodide perovskite can make high-efficiency solar cells, which also show an unexplained photocurrent hysteresis dependent on the device-poling history. Here we report quasielastic neutron scattering measurements showing that dipolar CH3NH3 + ions reorientate between the faces, corners or edges of the pseudo-cubic lattice cages in CH3NH3PbI3 crystals with a room temperature residence time of ∼14 ps. Free rotation, π-flips and ionic diffusion are ruled out within a 1–200-ps time window. Monte Carlo simulations of interacting CH3NH3 + dipoles realigning within a 3D lattice suggest that the scattering measurements may be explained by the stabilization of CH3NH3 + in either antiferroelectric or ferroelectric domains. Collective realignment of CH3NH3 + to screen a device’s built-in potential could reduce photovoltaic performance. However, we estimate the timescale for a domain wall to traverse a typical device to be ∼0.1–1 ms, faster than most observed hysteresis.

Enhanced Grain Size and Crystallinity in CH3NH3PbI3 Perovskite Films by Metal Additives to the Single-Step Solution Fabrication Process

MRS Advances ◽  
2018 ◽  
Vol 3 (55) ◽  
pp. 3237-3242 ◽  
Author(s):  
Zahrah S. Almutawah ◽  
Suneth C. Watthage ◽  
Zhaoning Song ◽  
Ramez H. Ahangharnejhad ◽  
Kamala K. Subedi ◽  
...  
Keyword(s):  
Grain Size ◽  
Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Single Step ◽  
Fabrication Process ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide

ABSTRACTMethods of obtaining large grain size and high crystallinity in absorber materials play an important role in fabrication of high-performance methylammonium lead iodide (MAPbI3) perovskite solar cells. Here we study the effect of adding small concentrations of Cd2+, Zn2+, and Fe2+salts to the perovskite precursor solution used in the single-step solution fabrication process. Enhanced grain size and crystallinity in MAPbI3 films were obtained by using 0.1% of Cd2+ or Zn2+in the precursor solution. Consequently, solar cells constructed with Cd- and Zn-doped perovskite films show a significant improvement in device performance. These results suggest that the process may be an effective and facile method to fabricate high-efficiency perovskite photovoltaic devices.

scholarly journals Intermediate Phase‐Free Process for Methylammonium Lead Iodide Thin Film for High‐Efficiency Perovskite Solar Cells

2021 ◽  
pp. 2102492
Author(s):  
Yeonghun Yun ◽  
Devthade Vidyasagar ◽  
Minho Lee ◽  
Oh Yeong Gong ◽  
Jina Jung ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
High Efficiency ◽  
Intermediate Phase ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Free Process ◽  
Methylammonium Lead Iodide

The chemical origin of the p-type and n-type doping effects in the hybrid methylammonium–lead iodide (MAPbI3) perovskite solar cells

2015 ◽  
Vol 51 (80) ◽  
pp. 14917-14920 ◽  
Author(s):  
Lyubov A. Frolova ◽  
Nadezhda N. Dremova ◽  
Pavel A. Troshin
Keyword(s):  
Solar Cells ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Doping Effects ◽  
P Type ◽  
Methylammonium Lead Iodide

A field-induced and photoinduced self-doping chemistry of the MAPbI3 perovskite films affecting their photovoltaic performance and stability is proposed.

scholarly journals Hysteresis Passivation in Planar Perovskite Solar Cells Utilizing Facile Chemical Vapor Deposition Process and PCBM Interlayer

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4508
Author(s):  
Chongqiu Yang ◽  
Xiaobiao Shan ◽  
Tao Xie
Keyword(s):  
Solar Cells ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
High Efficiency ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Acid Methyl Ester ◽  
Chemical Vapor ◽  
Grain Structure ◽  
Lead Iodide

Low-cost, high-efficiency perovskite solar cells (PSCs) have the distinguished potential to be next commercialized photovoltaic devices. Chemical vapor deposition (CVD) process was regarded as an excellent choice as compared to solution deposition technique, however, the photovoltaic and stable performance of the former lags behind that of the latter. In this work, we propose a facile CVD pattern to fabricate PSCs, substrates covered by lead iodide (PbI2) sandwich-surrounded by the source methyl-ammonium iodide (CH3NH3I, MAI) powder. Heat and mass transfer, surface reactions are involved in the CVD deposition procedure. Numerical calculations present a uniform distribution of MAI vapor, contributing to homogeneous perovskite films with comparable surface morphologies, crystal structures and photovoltaic performances, despite of the notorious hysteresis. Herein, a PCBM ([6,6]-Phenyl C61 butyric acid methyl ester) interlayer is introduced before the PbI2 coating and the CVD process. Results show that even suffered from the torturous CVD procedure, the PCBM interlayer still works to passivating the bulk and interfacial recombination, reducing the hysteresis, improving the grain structure of perovskite films. Hence, the photovoltaic performance of PSCs enhances by 30%, and the filling factor difference between the forward and the reverse scan reduces to 6%.

scholarly journals High efficiency single-junction semitransparent perovskite solar cells

2014 ◽  
Vol 7 (9) ◽  
pp. 2968-2973 ◽  
Author(s):  
Cristina Roldán-Carmona ◽  
Olga Malinkiewicz ◽  
Rafael Betancur ◽  
Giulia Longo ◽  
Cristina Momblona ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Single Junction ◽  
Methylammonium Lead Iodide

Semitransparent efficient methylammonium lead iodide perovskite based solar cells.

Improved photovoltaic performance in perovskite solar cells based on CH3NH3PbI3 films fabricated under controlled relative humidity

RSC Advances ◽  
2015 ◽  
Vol 5 (114) ◽  
pp. 93957-93963 ◽  
Author(s):  
Minghang Lv ◽  
Xu Dong ◽  
Xiang Fang ◽  
Bencai Lin ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Relative Humidity ◽  
High Efficiency ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hybrid Perovskite ◽  
High Efficiency Solar Cells

The relative humidity and solvent is demonstrated for the controlled ambient crystallization of dense uniform hybrid-perovskite films for high-efficiency solar cells.

scholarly journals Effects of Solution-Based Fabrication Conditions on Morphology of Lead Halide Perovskite Thin Film Solar Cells

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Jeremy L. Barnett ◽  
Vivien L. Cherrette ◽  
Connor J. Hutcherson ◽  
Monica C. So
Keyword(s):  
Solar Cells ◽  
Film Formation ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Thin Film Solar Cells ◽  
Solution Temperature ◽  
Processing Conditions ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide ◽  
Lead Halide

We present a critical review of the effects of processing conditions on the morphology of methylammonium lead iodide (CH3NH3PbI3) perovskite solar cells. Though difficult to decouple from synthetic and film formation effects, a single morphological feature, specifically grain size, has been evidently linked to the photovoltaic performance of this class of solar cells. Herein, we discuss experimental aspects of optimizing the (a) temperature and time of annealing, (b) spin-coating parameters, and (c) solution temperature of methylammonium iodide (MAI) solution.

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