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Overcoming the thickness paradox: Systematical optimization of inverted polymer solar cells
Xinyuan Xia,Zuqiang Bian,Chunhui Huang 한국물리학회 2015 Current Applied Physics Vol.15 No.11
Inverted structure comes out to be a promising alternative for making polymer solar cells (PSC) with high efficiency and long-term stability. Vertically stacked functional layers with planar shapes often suffer contradictions in holding high optical absorption and excellent charge transfer/hindrance capability to construct well performed inverted PSC devices. Here, we give an example of rational control of the thickness of electron transport layer (ETL), hole transport layer (HTL) and organic active layer (OAL) to achieve a synergistic effect on promoting the overall photovoltaic behaviors. With in-depth exploration of the interaction between device performance and layer thickness, we obtain the optimized device ITO/ ZnO Ncs (45 nm)/P3HT:PCBM (70 nm)/MoO3 (1 nm)/Ag (70 nm) exhibiting an Voc of 0.63 V, Jsc of 12.52 mA/cm2, FF of 54% and PCE of 4.26%.