Solution Processed Ternary Tin (II) Alloy as Hole–Transport Layer of Sn–Pb Perovskite Solar Cells for Enhanced Efficiency and Stability

Yu, Zhenhua; Wang, Jiantao; Chen, Bo; Uddin, Md Aslam; Ni, Zhenyi; Yang, Guang; Huang, Jinsong

doi:10.1002/adma.202205769

Solution Processed Ternary Tin (II) Alloy as Hole–Transport Layer of Sn–Pb Perovskite Solar Cells for Enhanced Efficiency and Stability

Journal Article · Fri Sep 30 00:00:00 EDT 2022 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202205769· OSTI ID:1891004

^[1]; Wang, Jiantao ^[2]; Chen, Bo ^[2]; Uddin, Md Aslam ^[2]; Ni, Zhenyi ^[2]; Yang, Guang ^[2]; ^[2]

Univ. of North Carolina, Chapel Hill, NC (United States); UNC
Univ. of North Carolina, Chapel Hill, NC (United States)

Tin-lead (Sn-Pb) narrow bandgap (NBG) perovskites show great potential in both single-junction and all-perovskite tandem solar cells. Sn-Pb perovskite solar cells (PSCs) are still limited by low charge collection efficiency and poor stability. Here, we report a ternary Sn (II) alloy of SnOCl as the hole-transport material (HTM) with a work function of 4.95 eV for Sn-Pb PSCs. The solution processed SnOCl layer has a texture structure which not only reduces the optical loss of the devices but also changes grain growth of Sn-Pb perovskites and boosts the carrier diffusion length to 3.63 μm. The formation of small perovskite grains at the HTM/perovskite interface is suppressed. These result in an almost constant internal quantum efficiency of 96 ± 2% across the absorption spectrum of Sn-Pb perovskites. The SnOCl HTM significantly enhances the stability of Sn-Pb PSCs with 87% of its initial efficiency retained after 1-sun illumination for 1,200 h, and keep 85% efficiency under 85°C thermal stress for 1,500 h. Furthermore, the hybrid HTM further improve the stabilized efficiencies of single-function Sn-Pb PSCs and all-perovskite tandem solar cells to 23.2% and 25.9%, respectively. This discovery opens an avenue to the multi-component metal alloys as HTM in PSCs.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008749

OSTI ID:: 1891004

Alternate ID(s):: OSTI ID: 1894674
OSTI ID: 1902593

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 49 Vol. 34; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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