An antibonding valence band maximum enables defect-tolerant and stable GeSe photovoltaics

Shun-Chang Liu, Chen-Min Dai, Yimeng Min, Yi Hou, Andrew H. Proppe, Ying Zhou, Chao Chen, Shiyou Chen, Jiang Tang, Ding-Jiang Xue (), Edward H. Sargent () and Jin-Song Hu ()
Additional contact information
Shun-Chang Liu: Institute of Chemistry, Chinese Academy of Sciences
Chen-Min Dai: East China Normal University
Yimeng Min: Department of Electrical and Computer Engineering, University of Toronto
Yi Hou: Department of Electrical and Computer Engineering, University of Toronto
Andrew H. Proppe: Department of Electrical and Computer Engineering, University of Toronto
Ying Zhou: Huazhong University of Science and Technology
Chao Chen: Huazhong University of Science and Technology
Shiyou Chen: East China Normal University
Jiang Tang: Huazhong University of Science and Technology
Ding-Jiang Xue: Institute of Chemistry, Chinese Academy of Sciences
Edward H. Sargent: Department of Electrical and Computer Engineering, University of Toronto
Jin-Song Hu: Institute of Chemistry, Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract In lead–halide perovskites, antibonding states at the valence band maximum (VBM)—the result of Pb 6s-I 5p coupling—enable defect-tolerant properties; however, questions surrounding stability, and a reliance on lead, remain challenges for perovskite solar cells. Here, we report that binary GeSe has a perovskite-like antibonding VBM arising from Ge 4s-Se 4p coupling; and that it exhibits similarly shallow bulk defects combined with high stability. We find that the deep defect density in bulk GeSe is ~1012 cm−3. We devise therefore a surface passivation strategy, and find that the resulting GeSe solar cells achieve a certified power conversion efficiency of 5.2%, 3.7 times higher than the best previously-reported GeSe photovoltaics. Unencapsulated devices show no efficiency loss after 12 months of storage in ambient conditions; 1100 hours under maximum power point tracking; a total ultraviolet irradiation dosage of 15 kWh m−2; and 60 thermal cycles from −40 to 85 °C.

Date: 2021
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-021-20955-5 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-20955-5

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-021-20955-5

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().