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Title: Reducing Saturation-Current Density to Realize High-Efficiency Low-Bandgap Mixed Tin-Lead Halide Perovskite Solar Cells

Abstract

We report the unsatisfactory performance of low-bandgap mixed tin (Sn)-lead (Pb) halide perovskite subcells has been one of the major obstacles hindering the progress of the power conversion efficiencies (PCEs) of all-perovskite tandem solar cells. By analyzing dark-current density and distribution, it is identified that charge recombination at grain boundaries is a key factor limiting the performance of low-bandgap mixed Sn-Pb halide perovskite subcells. It is further found that bromine (Br) incorporation can effectively passivate grain boundaries and lower the dark current density by two-three orders of magnitude. By optimizing the Br concentration, low-bandgap (1.272 eV) mixed Sn-Pb halide perovskite solar cells are fabricated with open-circuit voltage deficits as low as 0.384 V and fill factors as high as 75%. The best-performing device demonstrates a PCE of >19%. In conclusion, the results suggest an important direction for improving the performance of low-bandgap mixed Sn-Pb halide perovskite solar cells.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [2];  [1]
  1. Univ. of Toledo, OH (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
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). SunShot Initiative; USDOE
OSTI Identifier:
1487330
Alternate Identifier(s):
OSTI ID: 1483438
Report Number(s):
NREL/JA-5K00-72548
Journal ID: ISSN 1614-6832
Grant/Contract Number:  
AC36-08GO28308; FOA‐0000990; FOA-0000990; AC36-08-GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 2018; Journal Issue: none; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; dark saturation current; grain boundary passivation; low-bandgap perovskites; perovskite solar cells

Citation Formats

Li, Chongwen, Song, Zhaoning, Zhao, Dewei, Xiao, Chuanxiao, Subedi, Biwas, Shrestha, Niraj, Junda, Maxwell M., Wang, Changlei, Jiang, Chun-Sheng, Al-Jassim, Mowafak, Ellingson, Randy J., Podraza, Nikolas J., Zhu, Kai, and Yan, Yanfa. Reducing Saturation-Current Density to Realize High-Efficiency Low-Bandgap Mixed Tin-Lead Halide Perovskite Solar Cells. United States: N. p., 2018. Web. doi:10.1002/aenm.201803135.
Li, Chongwen, Song, Zhaoning, Zhao, Dewei, Xiao, Chuanxiao, Subedi, Biwas, Shrestha, Niraj, Junda, Maxwell M., Wang, Changlei, Jiang, Chun-Sheng, Al-Jassim, Mowafak, Ellingson, Randy J., Podraza, Nikolas J., Zhu, Kai, & Yan, Yanfa. Reducing Saturation-Current Density to Realize High-Efficiency Low-Bandgap Mixed Tin-Lead Halide Perovskite Solar Cells. United States. doi:10.1002/aenm.201803135.
Li, Chongwen, Song, Zhaoning, Zhao, Dewei, Xiao, Chuanxiao, Subedi, Biwas, Shrestha, Niraj, Junda, Maxwell M., Wang, Changlei, Jiang, Chun-Sheng, Al-Jassim, Mowafak, Ellingson, Randy J., Podraza, Nikolas J., Zhu, Kai, and Yan, Yanfa. Tue . "Reducing Saturation-Current Density to Realize High-Efficiency Low-Bandgap Mixed Tin-Lead Halide Perovskite Solar Cells". United States. doi:10.1002/aenm.201803135. https://www.osti.gov/servlets/purl/1487330.
@article{osti_1487330,
title = {Reducing Saturation-Current Density to Realize High-Efficiency Low-Bandgap Mixed Tin-Lead Halide Perovskite Solar Cells},
author = {Li, Chongwen and Song, Zhaoning and Zhao, Dewei and Xiao, Chuanxiao and Subedi, Biwas and Shrestha, Niraj and Junda, Maxwell M. and Wang, Changlei and Jiang, Chun-Sheng and Al-Jassim, Mowafak and Ellingson, Randy J. and Podraza, Nikolas J. and Zhu, Kai and Yan, Yanfa},
abstractNote = {We report the unsatisfactory performance of low-bandgap mixed tin (Sn)-lead (Pb) halide perovskite subcells has been one of the major obstacles hindering the progress of the power conversion efficiencies (PCEs) of all-perovskite tandem solar cells. By analyzing dark-current density and distribution, it is identified that charge recombination at grain boundaries is a key factor limiting the performance of low-bandgap mixed Sn-Pb halide perovskite subcells. It is further found that bromine (Br) incorporation can effectively passivate grain boundaries and lower the dark current density by two-three orders of magnitude. By optimizing the Br concentration, low-bandgap (1.272 eV) mixed Sn-Pb halide perovskite solar cells are fabricated with open-circuit voltage deficits as low as 0.384 V and fill factors as high as 75%. The best-performing device demonstrates a PCE of >19%. In conclusion, the results suggest an important direction for improving the performance of low-bandgap mixed Sn-Pb halide perovskite solar cells.},
doi = {10.1002/aenm.201803135},
journal = {Advanced Energy Materials},
number = none,
volume = 2018,
place = {United States},
year = {2018},
month = {11}
}

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