Journal ArticleDOI
Structural and chemical evolution of methylammonium lead halide perovskites during thermal processing from solution
David P. Nenon,Jeffrey A. Christians,Lance M. Wheeler,Jeffrey L. Blackburn,Erin M. Sanehira,Erin M. Sanehira,Benjia Dou,Benjia Dou,Michele L. Olsen,Kai Zhu,Joseph J. Berry,Joseph M. Luther +11 more
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TLDR
In this paper, the evolution of perovskites formed from targeted precursor chemistries was investigated by correlating in situ temperature-dependent X-ray diffraction, thermogravimetric analysis, and mass spectral analysis of the evolved species.Abstract:
Following the prominent success of CH3NH3PbI3 in photovoltaics and other optoelectronic applications, focus has been placed on better understanding perovskite crystallization from precursor and intermediate phases in order to facilitate improved crystallinity often desirable for advancing optoelectronic properties. Understanding of stability and degradation is also of critical importance as these materials seek commercial applications. In this study, we investigate the evolution of perovskites formed from targeted precursor chemistries by correlating in situ temperature-dependent X-ray diffraction, thermogravimetric analysis, and mass spectral analysis of the evolved species. This suite of analyses reveals important precursor composition-induced variations in the processes underpinning perovskite formation and degradation. The addition of Cl− leads to widely different precursor evolution and perovskite formation kinetics, and results in significant changes to the degradation mechanism, including suppression of crystalline PbI2 formation and modification of the thermal stability of the perovskite phase. This work highlights the role of perovskite precursor chemistry in both its formation and degradation.read more
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Journal ArticleDOI
Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics.
Abhishek Swarnkar,Abhishek Swarnkar,Ashley R. Marshall,Ashley R. Marshall,Erin M. Sanehira,Erin M. Sanehira,Boris D. Chernomordik,David T. Moore,Jeffrey A. Christians,Tamoghna Chakrabarti,Joseph M. Luther +10 more
TL;DR: N nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices and describe the formation of α-CsP bI3 QD films that are phase-stable for months in ambient air.
Journal ArticleDOI
Intriguing Optoelectronic Properties of Metal Halide Perovskites
TL;DR: This review is a critical account of the interrelation between MHP electronic structure, absorption, emission, carrier dynamics and transport, and other relevant photophysical processes that have propelled these materials to the forefront of modern optoelectronics research.
Journal ArticleDOI
Tailored interfaces of unencapsulated perovskite solar cells for >1,000 hour operational stability
Jeffrey A. Christians,Philip Schulz,Jonathan S. Tinkham,Tracy H. Schloemer,Steven P. Harvey,Bertrand J. Tremolet de Villers,Alan Sellinger,Alan Sellinger,Joseph J. Berry,Joseph M. Luther +9 more
TL;DR: The perovskite absorber material itself has been heavily scrutinized for being prone to degradation by water, oxygen and ultraviolet light as discussed by the authors, and it has been shown that even under the combined stresses of light (including ultraviolet light), oxygen and moisture, perovsite solar cells can retain 94% of peak efficiency despite 1,000 hours of continuous unencapsulated operation in ambient air conditions (relative humidity of 10-20%).
Journal ArticleDOI
Stable high efficiency two-dimensional perovskite solar cells via cesium doping
Xu Zhang,Xu Zhang,Xu Zhang,Xiaodong Ren,Bin Liu,Rahim Munir,Xuejie Zhu,Dong Yang,Jianbo Li,Yucheng Liu,Detlef-M. Smilgies,Ruipeng Li,Zhou Yang,Tianqi Niu,Xiuli Wang,Aram Amassian,Kui Zhao,Shengzhong Liu,Shengzhong Liu +18 more
TL;DR: In this paper, the authors demonstrate cesium cation (Cs+) doped 2D (BA)2(MA)3Pb4I13 perovskite solar cells giving a power conversion efficiency (PCE) as high as 13.7%.
Journal ArticleDOI
Thermal degradation of CH3NH3PbI3 perovskite into NH3 and CH3I gases observed by coupled thermogravimetry–mass spectrometry analysis
TL;DR: In this paper, a thermal gravimetric and differential thermal analysis (TG-DTA) coupled with quadrupole mass spectrometry (MS) and first principles calculations were employed to elucidate the chemical nature of released gases during the thermal decomposition of CH3NH3PbI3.
References
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Journal ArticleDOI
Evolution of Chemical Composition, Morphology, and Photovoltaic Efficiency of CH3NH3PbI3 Perovskite under Ambient Conditions
TL;DR: The surface composition and morphology of CH3NH3PbI3 perovskite films stored for several days under ambient conditions were investigated by X-ray photoelectron spectroscopy, scanning electron microscopy, and Xray diffraction techniques as mentioned in this paper.
Journal ArticleDOI
Influence of moisture on the preparation, crystal structure, and photophysical properties of organohalide perovskites
Kelsey K. Bass,R. Eric McAnally,Shiliang Zhou,Peter I. Djurovich,Mark E. Thompson,Brent C. Melot +5 more
TL;DR: While the as-prepared iodide phase is non-emissive, the lifetime of the emission for the bromide is found to be much longer when prepared under atmospheric conditions.
Journal ArticleDOI
Understanding the solvent-assisted crystallization mechanism inherent in efficient organic–inorganic halide perovskite solar cells
Dinghan Shen,Xiao Yu,Xin Cai,Ming Peng,Yingzhuang Ma,Xin Su,Lixin Xiao,Dechun Zou,Dechun Zou +8 more
TL;DR: In this article, a planar heterojunction (PHJ) perovskite solar cells achieved a high power conversion efficiency of up to 13.8% when combined with a double blocking layer structure to prevent shunting.
Journal ArticleDOI
Chlorine Doping Reduces Electron–Hole Recombination in Lead Iodide Perovskites: Time-Domain Ab Initio Analysis
Jin Liu,Oleg V. Prezhdo +1 more
TL;DR: Using nonadiabatic (NA) molecular dynamics, combined with time-domain density functional theory, it is shown that nonradiative recombination happens faster than radiative recombinations and long-range charge transfer to an acceptor material.
Journal ArticleDOI
Monitoring the Phase Formation of Coevaporated Lead Halide Perovskite Thin Films by in Situ X-ray Diffraction.
TL;DR: Progress is shown identifying phases present during the growth of (CH3NH3)Pb(I,Cl)3 perovskite thin films with the vacuum-based coevaporation approach using two sources under varying deposition conditions and during post deposition annealing.