期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 23, 页码 8848-8856出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c03087
关键词
perovskite solar cell; surface passivation; electron transport material; high efficiency; device stability
资金
- National Key R&D Program of China [2018YFC0910602]
- NNSFC [81727804, 61525503, 61775145, 61835009, 61620106016]
- DFG [BR 4031/13-1]
- Department of Education of Guangdong Province [2016KCXTD007, 2015KGJHZ002]
- CPSFFP [2018M643147]
- Shenzhen BRP [JCYJ20170412110212234, JCYJ20170412105003520]
- [SFB 953 (DFG 182849149)]
PCBM is a fullerene derivative, which is commonly employed as an electron transport layer (ETL), and still has some issues to fabricate low temperature-processed perovskite solar cells (PSCs) such as surface trap states, low electron mobility, and extra recombination losses at the perovskite/PCBM interface. Herein, a novel perylene diimide dimer (2FBT2FPDI) is synthesized and employed as an ETL or intermediary layer to overcome these challenges. Owing to its suitable energy levels and high electron mobility, 2FBT2FPDI shows great potential to serve as a promising efficient ETL in the photovoltaic devices. Moreover, 2FBT2FPDI can coordinate with the lead site of the perovskite surface, which helps to heal the surface defects and suppress charge-trapped recombination. Therefore, the performance of PSCs is greatly improved from 17.3 to 20.3%, when 2FBT2FPDI the growth of the molecules for low was used as the intermediary layer to assist PCBM film. This work presents a new direction through interface engineering with n-type nonfullerene small temperature-processed stable and highly efficient inverted PSCs.
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