期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 12, 页码 10983-10991出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b00902
关键词
perovskite solar cell; perylene diimide; electron mobility; energy alignment; film morphology
资金
- NSFC [51573042]
- National Natural Science Foundation of Beijing [2162045]
- Chinese Academy of Sciences [QYZDB-SSW-SLH033]
- National Key Basic Research Program of China (973 Project) [201SCB932201]
- Science and Technology Support Program of Jiangsu Province [BE2014147-4]
- State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University) [201404]
- Fundamental Research Funds for the Central Universities, China [JB2015RCJ02, 2016YQ06, 2015ZZD06]
For organic inorganic perovskite solar cells (PerSCs), the electron transport layer (ETL) plays a crucial role in efficient electron extraction and transport for high performance PerSCs. Fullerene and its derivatives are commonly used as ETL for p- i-n structured PerSCs. However, these spherical small molecules are easy to aggregate with high annealing temperature and thus induce morphology stability problems. N-type conjugated polymers are promising candidates to overcome these problems due to the tunable energy levels, controllable aggregation behaviors, and good film formation abilities. Herein, a series of perylene diimide (PDI) based polymers (PX-PDIs), which contain different copolymeried units (X), including vinylene (V), thiophene (T), selenophene (Se), dibenzosilole (DBS), and cyclopentadithiophene (CPDT), are introduced-as ETL for p-i-n-structured PerSCs. The effect of energy alignment, electron mobility, and film morphology of these ETLs on the photovoltaic performance of the PerSCs are fully investigated. Among the PX-PDIs, PV-PDI demonstrates the deeper LUMO energy level, the highly delocalized LUMO electron density, and a better planar structure, making it the best electron transport material for PerSCs. The planar heterojunction PerSC with PV-PDI as ETL achieves a power conversion efficiency (PCE) of 10.14%, among the best values for non-fullerene based PerSCs.
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