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Title: Operando Microscopy Characterization of Perovskite Solar Cells: Preprint

Abstract

In this work, we developed operando Kelvin probe force microscopy (KPFM) to study the electrostatic potential distribution across perovskite cells under light and forward bias to gain a deeper understanding of device operation physics. As a case study, we selected perovskite cells with a SnO2-based electron-selective layer (ESL), which showed great potential for fabricating high-efficiency, hysteresis-free devices due to the deeper conduction band and higher electron mobility of SnO2. The as-made device showed a main junction at the perovskite/spiro interface. After light soaking and applying forward bias, the junction quality improved, possibly explained by filling trap states at the interfaces and by the perovskite absorber perhaps having a self-poling effect; the main junction is observed at the ESL/perovskite interface. The results are consistent with current-voltage measurements, device performance improves mainly with fill factor enhancement. The operando KPFM results should more closely reflect the real case during current density-voltage measurements or solar cell operation. The operando KPFM technique that we have developed can be a powerful tool to provide a deeper understanding of the device operation mechanism and to further optimize the device.

Authors:
 [1];  [2];  [1];  [3];  [3];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. University of Toledo; Soochow University
  3. University of Toledo
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1529860
Report Number(s):
NREL/CP-5K00-73109
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 46th IEEE Photovoltaic Specialists Conference (PVSC 46), 16-21 June 2019, Chicago, Illinois
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; perovskite; junction quality; operando KPFM; interface; fill factor; enhancement

Citation Formats

Xiao, Chuanxiao, Wang, Changlei, Jiang, Chun Sheng, Song, Zhaoning, Yan, Yanfa, and Al-Jassim, Mowafak M. Operando Microscopy Characterization of Perovskite Solar Cells: Preprint. United States: N. p., 2019. Web.
Xiao, Chuanxiao, Wang, Changlei, Jiang, Chun Sheng, Song, Zhaoning, Yan, Yanfa, & Al-Jassim, Mowafak M. Operando Microscopy Characterization of Perovskite Solar Cells: Preprint. United States.
Xiao, Chuanxiao, Wang, Changlei, Jiang, Chun Sheng, Song, Zhaoning, Yan, Yanfa, and Al-Jassim, Mowafak M. Thu . "Operando Microscopy Characterization of Perovskite Solar Cells: Preprint". United States. https://www.osti.gov/servlets/purl/1529860.
@article{osti_1529860,
title = {Operando Microscopy Characterization of Perovskite Solar Cells: Preprint},
author = {Xiao, Chuanxiao and Wang, Changlei and Jiang, Chun Sheng and Song, Zhaoning and Yan, Yanfa and Al-Jassim, Mowafak M},
abstractNote = {In this work, we developed operando Kelvin probe force microscopy (KPFM) to study the electrostatic potential distribution across perovskite cells under light and forward bias to gain a deeper understanding of device operation physics. As a case study, we selected perovskite cells with a SnO2-based electron-selective layer (ESL), which showed great potential for fabricating high-efficiency, hysteresis-free devices due to the deeper conduction band and higher electron mobility of SnO2. The as-made device showed a main junction at the perovskite/spiro interface. After light soaking and applying forward bias, the junction quality improved, possibly explained by filling trap states at the interfaces and by the perovskite absorber perhaps having a self-poling effect; the main junction is observed at the ESL/perovskite interface. The results are consistent with current-voltage measurements, device performance improves mainly with fill factor enhancement. The operando KPFM results should more closely reflect the real case during current density-voltage measurements or solar cell operation. The operando KPFM technique that we have developed can be a powerful tool to provide a deeper understanding of the device operation mechanism and to further optimize the device.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

Conference:
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