Stable AgBiS2 near-infrared absorbers for thin film tandem photovoltaics
Abstract
AgBiS2 has rapidly risen in efficiency as single-junction photovoltaics (PVs), but its potential for tandem PVs is unexplored. Herein, we perform optical modeling based on the experimental absorption spectrum of AgBiS2, revealing that, as the NIR sub-cell, efficiencies exceeding 47.9% are achievable in triple-junction tandems, superseding tandems using Pb/Sn perovskite NIR cells (35.9%). However, fulfilling this potential requires overcoming the limited transport properties of AgBiS2 nanocrystal films, which constrains film thicknesses to only 30-50 nm, severely restricting NIR response. A solution-phase ligand exchange process is herein developed, allowing one-step deposition of passivated AgBiS2 nanocrystals that maintain efficient charge-carrier extraction despite an order of magnitude increase in film thickness. These films enable 24.0%-efficient four-terminal tandems with visible-light-absorbing lead-halide perovskite sub-cells, and monolithic tandems successfully demonstrating voltage addition. AgBiS2 PVs have high stability, retaining >90% of the original efficiency after 3 months of storage in dry air without encapsulation. This work establishes the significant potential of AgBiS2 as a stable and scalable NIR absorber for tandem PVs.
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BibTeX
@misc{dong2026stable,
title = {{Stable AgBiS2 near-infrared absorbers for thin film tandem photovoltaics}},
author = {Shiling Dong and Yongjie Wang and Hae-Jun Seok and Mengyuan Huang and Edward Newton and Der Ying Chen and Yixin Wang and Xiaoyu Guo and Keisuke Takemoto and Dusan Ivanovic and Avari Roy and Yongge Yang and Grey Christoforo and Rebekah Fraser and Seongrok Seo and John O'Sullivan and Ha Kyung Park and Jack M. Woolley and Ji-Seon Kim and Ruy S. Bonilla and Henry J. Snaith and Qing Shen and Aditya Sadhanala and Lydia H. Wong and Robert L. Z. Hoye},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.01797},
eprint = {2611.01797},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.01797},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Stable AgBiS2 near-infrared absorbers for thin film tandem photovoltaics
AU - Shiling Dong
AU - Yongjie Wang
AU - Hae-Jun Seok
AU - Mengyuan Huang
AU - Edward Newton
AU - Der Ying Chen
AU - Yixin Wang
AU - Xiaoyu Guo
AU - Keisuke Takemoto
AU - Dusan Ivanovic
AU - Avari Roy
AU - Yongge Yang
AU - Grey Christoforo
AU - Rebekah Fraser
AU - Seongrok Seo
AU - John O'Sullivan
AU - Ha Kyung Park
AU - Jack M. Woolley
AU - Ji-Seon Kim
AU - Ruy S. Bonilla
AU - Henry J. Snaith
AU - Qing Shen
AU - Aditya Sadhanala
AU - Lydia H. Wong
AU - Robert L. Z. Hoye
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.01797
UR - https://arxiv.org/abs/2611.01797
AB - AgBiS2 has rapidly risen in efficiency as single-junction photovoltaics (PVs), but its potential for tandem PVs is unexplored. Herein, we perform optical modeling based on the experimental absorption spectrum of AgBiS2, revealing that, as the NIR sub-cell, efficiencies exceeding 47.9% are achievable in triple-junction tandems, superseding tandems using Pb/Sn perovskite NIR cells (35.9%). However, fulfilling this potential requires overcoming the limited transport properties of AgBiS2 nanocrystal films, which constrains film thicknesses to only 30-50 nm, severely restricting NIR response. A solution-phase ligand exchange process is herein developed, allowing one-step deposition of passivated AgBiS2 nanocrystals that maintain efficient charge-carrier extraction despite an order of magnitude increase in film thickness. These films enable 24.0%-efficient four-terminal tandems with visible-light-absorbing lead-halide perovskite sub-cells, and monolithic tandems successfully demonstrating voltage addition. AgBiS2 PVs have high stability, retaining >90% of the original efficiency after 3 months of storage in dry air without encapsulation. This work establishes the significant potential of AgBiS2 as a stable and scalable NIR absorber for tandem PVs.
ER -