DataVXACS Energy LettersPaper
journal article·2022-09-09

Domain Size, Temperature, and Time Dependence of Photodegradation in MAPbI3 Probed by Raman Spectroscopy

Jose F. Castaneda, Jeong-Hyeok Im, Yucheng Liu, Shengzhong Liu, Nam-Gyu Park, Yong Zhang

ACS Energy Letters· Volume 7· Issue 9
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Source abstract

Abstract

Organic–inorganic hybrid perovskites display remarkable photovoltaic properties, but instability arises from the material’s surface and photoexcitation. The photodegradation process of methylammonium lead triiodide (MAPbI3) investigated with above bandgap excitation Raman spectroscopy displays two stages of structural change in polycrystalline films of varying domain sizes and a single crystal. Subtle surface changes occur below an excitation density threshold; PbI2 formation scales linearly above this threshold in thin films. However, the rate of change with excitation density increases with more grain surfaces. Whereas with a moderate level of heating into the cubic phase, accelerated photodegradation occurs in a single crystal. From experimental kinetic modeling, PbI2 nuclei on the surface grow until they meet in the polycrystalline films, proceeding one-dimensionally inward from the surface. These results suggest that the surface acts as a location for photogenerated carrier accumulation, leading to degradation and PbI2 formation.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Nanoscale Science, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States

School of Chemical Engineering and Center for Antibonding Regulated Crystals, Sungkyunkwan University, Suwon 16419, Republic of Korea

Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710062, China

SKKU Institute of Energy Science & Technology (SIEST), Sungkyunkwan University, Suwon 16419, Republic of Korea

Department of Electrical and Computer Engineering, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States

Funding

Ministry of Science and Technology of the People's Republic of China · National Research Foundation of Korea · University of North Carolina · National Natural Science Foundation of China

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