期刊
ORGANIC ELECTRONICS
卷 17, 期 -, 页码 94-101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.11.023
关键词
Inverted polymer solar cells; Cathode interlayer; PEI; Work function; Interface resistance
资金
- National Natural Science Foundation of China [21204054, 51303118, 91333204]
- Natural Science Foundation of Jiangsu Province [BK20130289]
- Ph.D. Programs Foundation of Ministry of Education of China [20133201120008]
- Scientific Research Foundation for Returned Scholars, Ministry of Education of China
- Priority Academic Program Development of Jiangsu Higher Education Institutions
In this paper, we investigated the effect of PEI cathode interlayer on the work function and the interface resistance of ITO electrode in the inverted polymer solar cells (PSCs) based on PBDTTT-C-T: PC70BM. It is found that a very thin layer of PEI (<= 5.5 nm), either linear PEI (l-PEI) or branched PEI (b-PEI) with different molecular weights, is enough to lower the work function of the ITO electrode and to enhance the photovoltaic performance of the devices. The champion power conversion efficiency (PCE) of the devices with the PEI cathode interlayer is 7.84%, more than doubled of that without the interlayer. However, a thicker PEI interlayer (>= 10 nm) results in abrupt decrease of the PCEs due to the increase of the resistance. Interestingly, for the thicker interlayers, the l-PEI shows high photovoltaic performance than that of b-PEI, which can also be explained by their difference in the resistances. This work supplies an insight into the function of PEI cathode interlayer on improving the work function and resistance of ITO electrode in the inverted PSCs, and provides some instructions on the future design of interlayer materials in PSCs. (C) 2014 Elsevier B.V. All rights reserved.
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