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

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

doi:10.1002/aenm.201803135

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

Journal Article · Tue Nov 27 00:00:00 EST 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201803135· OSTI ID:1487330

Li, Chongwen ^[1]; Song, Zhaoning ^[1]; Zhao, Dewei ^[1]; Xiao, Chuanxiao ^[2]; Subedi, Biwas ^[1]; Shrestha, Niraj ^[1]; Junda, Maxwell M. ^[1]; Wang, Changlei ^[1]; Jiang, Chun-Sheng ^[2]; Al-Jassim, Mowafak ^[2]; Ellingson, Randy J. ^[1]; Podraza, Nikolas J. ^[1]; Zhu, Kai ^[2]; Yan, Yanfa ^[1]

Univ. of Toledo, OH (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Abstract 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%. The results suggest an important direction for improving the performance of low‐bandgap mixed Sn–Pb halide perovskite solar cells.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S). SunShot Initiative; USDOE

Grant/Contract Number:: AC36-08GO28308; FOA‐0000990; DE‐FOA‐0000990; DE‐AC36‐08‐GO28308

OSTI ID:: 1487330

Alternate ID(s):: OSTI ID: 1483438

Report Number(s):: NREL/JA-5K00-72548

Journal Information:: Advanced Energy Materials, Vol. 2018, Issue none; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 226 works

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
dark saturation current
grain boundary passivation
low-bandgap perovskites
perovskite solar cells

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

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