期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 28, 页码 18593-18599出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04955
关键词
polymer solar cells; inverted and conventional devices; cathode interlayers; zwitterions; charge recombination
资金
- National Natural Science Foundation of China [51273208, 51403222, 61474125]
- Zhejiang Provincial Natural Science Foundation of China [LR14E030002]
- Ningbo Science and Technology Bureau [2014B82010]
- National Young Top-Notch Talent Program of China
Organic ionic materials have been reported to be efficient cathode interlayer (CIL) materials in polymer solar cells (PSCs); however, most of them are employed in conventional PSCs. For an inverted structural device which has better stability, the efficiency is still far from expectation and the report is also limited. In this study, by using nonconjugated zwitterions as the CIL and inverted structure, the power conversion efficiency (PCE) is similar to 6%, though the PCE can reach 9.14% in the conventional device. By introducing polyethylene glycol (PEG) into the zwitterions, the PCE of the inverted PSCs was improved similar to 33% and reached similar to 8% mainly because of the enhancement of the open circuit voltage (V-oc) and fill factor (FF). Further research on the device parameters, work functions, morphology of indium tin oxide (ITO) with various CILs, and recombination resistance of the devices indicated that PEG + zwitterion induced not only a lower work function of ITO but also a more uniform morphology of CILs with less contact of the photoactive layer with ITO, which induced suppressed charge recombination and a higher Voc and FF. Enhanced ability in interface modification of PEG + zwitterion CILs displayed a simple and feasible approach to elevate the performance of inverted PSCs with ionic CILs.
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