Author(s): Azam, M (Azam, Muhammad); Khan, AA (Khan, Abbas Ahmad); Liang, GX (Liang, Guang-Xing); Li, GJ (Li, Gui-Jun); Chen, S (Chen, Shuo); Zheng, ZH (Zheng, Zhuang-Hao); Farooq, U (Farooq, Umar); Ishaq, M (Ishaq, Muhammad); Fan, P (Fan, Ping); Wang, ZJ (Wang, Zhijie); Wang, ZG (Wang, Zhan-Guo)

Source: SOLAR RRL Article Number: 2000358 DOI: 10.1002/solr.202000358 Early Access Date: SEP 2020

Abstract: In perovskite solar cells (PSCs), the interfaces between perovskite film and charge transport layers have an enormous influence on the device performance and stability. Recently, it has been proven that the surface defect passivation of perovskite layer is an effective strategy to improve the device efficiency. Herein, an organic ammonium salt benzyltriethylammonium chloride ([BZTAm]Cl) is used as an ultra-thin modification layer in perovskite films in MAPbI(3)PSCs for passivating the surface defects. The obtained results demonstrate that the [BZTAm]Cl modifier improves the crystallization/morphology of perovskite film and effectively aligns the energy levels with the corresponding charge-transporting layers, suppressing the nonradiative recombination and reducing the trap state density. As a result, a champion device efficiency of 20.45% is achieved for optimized concentration of [BZTAm]Cl in comparison with 17.87% for the control device. Moreover, the unencapsulated device presents a good long-term stability after aging in an ambient environment with 40-50% relative humidity conditions for 30 days.

Accession Number: WOS:000566315800001

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Khan, Abbas                  0000-0001-5443-8217

ISSN: 2367-198X

Full Text: https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.202000358