期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 28, 页码 18410-18417出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03724
关键词
inverted perovskite solar cell; cathode buffer layer; ZnO:PFN nanocomposites; enhanced power conversion efficiency; stability improvement
资金
- Jiangshu Provincial Natural Science Foundation [BK20130346]
- National Natural Science Foundation of China [61306073]
- Jiangshu Provincial Major Research Program [BE2015071]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09020201]
We have demonstrated in this article that both power conversion efficiency (PCE) and performance stability of inverted planar heterojunction perovskite solar cells can be improved by using a ZnO:PFN nanocomposite (PFN: poly[(9,9-bis(3'-N,N-dimethylamion)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl)-fluorene]) as the cathode buffer layer (CBL). This nanocomposite could form a compact and defect-less CBL film on the perovskite/PC61BM surface (PC61BM: phenyl-C-61-butyric acid methyl ester). In addition, the high conductivity of the nanocomposite layer makes it works well at a layer thickness of 150 nm. Both advantages of the composite layer are helpful in reducing interface charge recombination and improving device performance. The power conversion efficiency (PCE) of the best ZnO:PFN CBL based device was measured to be 12.76%, which is higher than that of device without CBL (9.00%), or device with ZnO (7.93%) or PFN (11.30%) as the cathode buffer layer. In addition, the long-term stability is improved by using ZnO:PFN composite cathode buffer layer when compare to that of the reference cells. Almost no degradation of open circuit voltage (V-OC) and fill factor (FF) was found for the device having ZnO:PFN, suggesting that ZnO:PFN is able to stabilize the interface property and consequently improve the solar cell performance stability.
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