Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 17, Pages 20103-20109Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02837
Keywords
interface engineering; inverted perovskite solar cell; cascaded energy level; defect passivation; high efficiency; ultrathin PCBM
Funding
- Guangdong High-level Personnel of Special Support Program-Outstanding Young Scholar in Science and Technology Innovation [2015TQ01C543]
- National Natural Science Foundation of China [51776094, 91963129]
- National Key Research and Development Project from the Ministry of Science and Technology of China [2016YFA0202400, 2016YFA0202404]
- Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370]
- Guangdong Provincial Key Laboratory of Energy Materials for Electric Power [2018B030322001]
- Shenzhen Engineering R&D Center for Flexible Solar Cells from Shenzhen Development and Reform Committee [2019-126]
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Inverted perovskite solar cells (PSCs) with a C-60 framework are known for their common drawback of low power conversion efficiency (PCE) of <20% because of nonradiative recombination and inefficient charge transport at their perovskite interfaces. Here, we report an ultrathin [6,6] -phenyl-C-61-butyric acid methyl ester (PCBM) as a cap layer on perovskite films to overcome this issue. Such a functional cap layer efficiently passivates trap states and establishes a gradient energy level alignment onto perovskite, facilitating the efficient charge transfer and extraction. The as-fabricated inverted PSCs capped with such ultrathin PCBM exhibit a record PCE of 20.07%. After the storage under a N-2 atmosphere for more than 500 h, the PCE of PSCs retains over 85% of its initial level. Our work provides an effective method to upgrade inverted PSCs with the C-60 framework with improved efficiency and stability.
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