Influence of voids on the thermal and light stability of perovskite solar cells

Wang, Mengru; Fei, Chengbin; Uddin, Md Aslam; Huang, Jinsong

doi:10.1126/sciadv.abo5977

Influence of voids on the thermal and light stability of perovskite solar cells

Journal Article · Fri Sep 23 00:00:00 EDT 2022 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abo5977· OSTI ID:1884128

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

The formation of voids in perovskite films close to the buried interface has been reported during film deposition. These voids are thought to limits the efficiency and stability of perovskite solar cells (PSCs). Here, we studied the voids formed during operation in perovskite films that were optimized during the solution deposition process to avoid voids. New voids formed during operation are found to assemble along grain boundaries at the bottom interface, caused by the loss of residual solvent and conversion of amorphous phase to crystalline phase. Unexpectedly, the formation of these voids did not negatively affect the stability of PSCs. Decreasing the amorphous region in perovskites by thermal annealing decreased the positive iodide interstitial density, and improved the light stability of PSCs. The annealed devices maintained 90% of their initial efficiency and light soaking for 1900 hours at open circuit condition under 1-sun illumination at 50°C.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office

Grant/Contract Number:: EE0009520

OSTI ID:: 1884128

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 38 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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