Oligomeric silica-wrapped perovskites enable synchronous defect passivation and grain stabilization for efficient and stable perovskite photovoltaics

Bai, Yang and Lin, Yun and Ren, Long and Shi, Xiaolei ORCID: https://orcid.org/0000-0003-0905-2547 and Strounina, Ekaterina and Deng, Yehao and Wang, Qi and Fang, Yanjun and Zheng, Xiaopeng and Lin, Yuze and Chen, Zhi-Gang and Du, Yi and Wang, Lianzhou and Huang, Jinsong (2019) Oligomeric silica-wrapped perovskites enable synchronous defect passivation and grain stabilization for efficient and stable perovskite photovoltaics. ACS Energy Letters, 4 (6). pp. 1231-1240.


Abstract

The intrinsic instability of hybrid perovskite materials induced by defect states arises as one major challenge hampering the commercialization of perovskite solar cells (PSCs). Here, we report a facile strategy of wrapping perovskite grains within an oligomeric silica (OS) matrix in a core−shell geometry, which can synchronously passivate the defects at surfaces and grain boundaries and stabilize the grains at the nanoscale. We observe a significant reduction of trap density and elongation of carrier lifetime in OS-wrapped perovskites, which yields an increased efficiency of 21.5% for p−i−n structured PSCs with a decent open-circuit voltage of 1.15 V and a fill factor of 0.81. This all-around nanoscale grain wrapping leads to remarkable improvement of the operational stability of PSCs, sustaining 80% of the efficiency after “burn-in” under full sunlight with UV for more than 5200 h. Our findings provide a new pathway towards efficient and stable PSCs.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2019 American Chemical Society.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 05 Mar 2020 05:11
Last Modified: 13 Mar 2020 06:53
Uncontrolled Keywords: perovskite, solar cells, methylammonium lead
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1021/acsenergylett.9b00608
URI: http://eprints.usq.edu.au/id/eprint/37932

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