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Title: Operando Characterizations of Light-Induced Junction Evolution in Perovskite Solar Cells

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [3];  [6]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States); Ningbo New Materials Testing and Evaluation Center CO., Ltd., Zhejiang (China); Chinese Academy of Sciences, Zhejiang (China)
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States); Hunan Normal University, Changsha (China)
  3. University of Toledo, OH (United States)
  4. National Renewable Energy Laboratory (NREL), Golden, CO (United States); Xiamen University (China)
  5. University of Toledo, OH (United States); Soochow University, Suzhou (China)
  6. National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Light-induced performance changes in metal halide perovskite solar cells (PSCs) have been studied intensively over the last decade, but little is known about the variation in microscopic optoelectronic properties of the perovskite heterojunctions in a completed device during operation. Here, we combine Kelvin probe force microscopy and transient reflection spectroscopy techniques to spatially resolve the evolution of junction properties during the operation of metal-halide PSCs and study the light-soaking effect. Our analysis showed a rise of an electric field at the hole-transport layer side, convoluted with a more reduced interfacial recombination rate at the electron-transport layer side in the PSCs with an n–i–p structure. The junction evolution is attributed to the effects of ion migration and self-poling by built-in voltage. Device performances are correlated with the changes of electrostatic potential distribution and interfacial carrier dynamics. Our results demonstrate a new route for studying the complex operation mechanism in PSCs.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1970401
Alternate ID(s):
OSTI ID: 1972287; OSTI ID: 1973221
Report Number(s):
NREL/JA-5K00-84562
Journal Information:
ACS Applied Materials and Interfaces, Vol. 15, Issue 17; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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