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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A facile route to grain morphology controllable perovskite thin films towards highly efficient perovskite solar cells
Fuguo Zhang,Jiayan Cong,Yuanyuan Li,Jan Bergstrand,Haichun Liu,Bin Cai,Alireza Hajian,Zhaoyang Yao,Linqin Wang,Yan Hao,Xichuan Yang,James M. Gardner,Hans Ågren,Jerker Widengren,Lars Kloo,Licheng Sun,Licheng Sun +16 more
TL;DR: Perovskite photovoltaics have recently attracted extensive attention due to their unprecedented high power conversion efficiencies (PCEs) in combination with primitive manufacturing conditions as discussed by the authors, but their performance has not yet reached the state-of-the-art.
Journal ArticleDOI
In Situ Real-Time Study of the Dynamic Formation and Conversion Processes of Metal Halide Perovskite Films.
Ke Meng,Longlong Wu,Zhou Liu,Xiao Wang,Qiaofei Xu,Youdi Hu,Sanfeng He,Xiaolong Li,Tao Li,Gang Chen,Gang Chen +10 more
TL;DR: In situ GI-XRD and infrared spectroscopy measurements reveal that the IA phases contain both N,N-dimethylformamide and dimethyl sulfoxide (DMSO) as coordinating molecules, and the ideal perovskite film is formed and the best PCE is achieved for the planar MAPbI3 -based PSCs.
Journal ArticleDOI
Prospects for Mitigating Intrinsic Organic Decomposition in Methylammonium Lead Triiodide Perovskite.
John A. McLeod,Lijia Liu +1 more
TL;DR: The experimental evidence behind several possible routes for MAPI to degrade into PbI2 and various organics is discussed, and how the decomposition path of MAPI may strongly depend on substrate, precursors, intrinsic organic defects, and morphology.
Journal ArticleDOI
Understanding size dependence of phase stability and band gap in CsPbI3 perovskite nanocrystals.
Ruo Xi Yang,Liang Z. Tan +1 more
TL;DR: A more accurate quantum confinement model is developed to predict the change in bandgaps at the sub-10 nm regime by including a finite-well effect and have important implications for synthesizing ever more stable perovskite NCs and bandgap engineering.
Journal ArticleDOI
Degradation Mechanism and Relative Stability of Methylammonium Halide Based Perovskites Analyzed on the Basis of Acid-Base Theory.
TL;DR: An experimental back-reaction test demonstrates that the well-known CH3NH2/HX degradation route may not be the ultimate degradation pathway of MAPbX3 in thermodynamic closed systems and an unambiguous identification of CH3I release using microwave (rotational) spectroscopy is presented.
References
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Journal ArticleDOI
Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
TL;DR: Two organolead halide perovskite nanocrystals were found to efficiently sensitize TiO(2) for visible-light conversion in photoelectrochemical cells, which exhibit strong band-gap absorptions as semiconductors.
Journal ArticleDOI
Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites
Michael M. Lee,Joël Teuscher,Tsutomu Miyasaka,Takurou N. Murakami,Takurou N. Murakami,Henry J. Snaith +5 more
TL;DR: A low-cost, solution-processable solar cell, based on a highly crystalline perovskite absorber with intense visible to near-infrared absorptivity, that has a power conversion efficiency of 10.9% in a single-junction device under simulated full sunlight is reported.
Journal ArticleDOI
Electron-hole diffusion lengths exceeding 1 micrometer in an organometal trihalide perovskite absorber.
Samuel D. Stranks,Giles E. Eperon,Giulia Grancini,Christopher Menelaou,Marcelo J. P. Alcocer,Tomas Leijtens,Laura M. Herz,Annamaria Petrozza,Henry J. Snaith +8 more
TL;DR: In this article, transient absorption and photoluminescence-quenching measurements were performed to determine the electron-hole diffusion lengths, diffusion constants, and lifetimes in mixed halide and triiodide perovskite absorbers.
Journal ArticleDOI
Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%
Hui-Seon Kim,Chang-Ryul Lee,Jeong-Hyeok Im,Ki Beom Lee,Thomas Moehl,Arianna Marchioro,Soo-Jin Moon,Robin Humphry-Baker,Jun-Ho Yum,Jacques-E. Moser,Michael Grätzel,Nam-Gyu Park +11 more
TL;DR: The use of a solid hole conductor dramatically improved the device stability compared to (CH3NH3)PbI3 -sensitized liquid junction cells.
Journal Article
Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber
Samuel D. Stranks,Giles E. Eperon,Giulia Grancini,Christopher Menelaou,Marcelo J. P. Alcocer,Tomas Leijtens,Laura M. Herz,Annamaria Petrozza,Henry J. Snaith +8 more
TL;DR: In this paper, transient absorption and photoluminescence-quenching measurements were performed to determine the electron-hole diffusion lengths, diffusion constants, and lifetimes in mixed halide and triiodide perovskite absorbers.