期刊
ADVANCED SCIENCE
卷 3, 期 2, 页码 -出版社
WILEY
DOI: 10.1002/advs.201500245
关键词
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资金
- National Key Basic Research Program of China (973 Program) [2014CB648300, 2015CB932203]
- National Natural Science Foundation of China [21422402, 61136003, 61376023]
- Natural Science Foundation of Jiangsu Province [BK20140060, BK20130037, BM2012010]
- Program for Jiangsu Specially-Appointed Professors [RK030STP15001]
- Program for New Century Excellent Talents in University [NCET-13-0872]
- Specialized Research Fund for the Doctoral Program of Higher Education [20133223110008, 20113223110005]
- Ministry of Education of China [IRT1148]
- NUPT 1311 Project
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- China Scholarship Council (CSC) [201408320174]
- [NY213119]
- [NY2012013]
Three kinds of charged star-shaped conjugated macroelectrolytes, named as PhNBr, TPANBr, and TrNBr, are synthesized as electron-collecting interlayers for inverted polymer solar cells (i-PSCs). Based on these well-defined structured interlayer materials, the light soaking (LS) effect observed in i-PSCs was studied systematically and accurately. The general character of the LS effect is further verified by studying additional i-PSC devices functionalized with other common interlayers. The key-role of UV photons was confirmed by electrochemical impedance spectroscopy and electron-only devices. In addition, the ultraviolet photoelectron spectroscopy measurements indicate that the work function of the indium tin oxide (ITO)/interlayer cathode is significantly reduced after UV treatment. In these i-PSC devices the LS effect originates from the adsorbed oxygen on the ITO substrates when oxygen plasma is used; however, even a small amount of oxygen from the ambient is also enough for triggering the LS effect, albeit with a weaker intensity. Our results suggest that the effect of adsorbed oxygen on ITO needs to be considered with attention while preparing i-PSCs. This is an important finding that can aid the large-scale manufacturing of organic solar cells via printing technologies, which do not always ensure the full protection of the device electrode substrates from oxygen.
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