Unraveling the effect of polymer dots doping in inverted low bandgap organic solar cells
Literature Information
Xinyuan Zhang, Chunyu Liu, Jinfeng Li, Yeyuan He, Zhiqi Li, Hao Li, Liang Shen, Wenbin Guo, Shengping Ruan
In this study, molecular doping with polymer dots was designed to unravel its effect on the photoconductivity in organic solar cells. The photocurrent in organic solar cells exhibited a considerable increase under optimal doping concentration, leading to an ultimate enhancement of power conversion efficiency from 2.30% to 3.64%. This can be attributed primarily to the improvement of the initial boost in charge carriers due to the background carriers induced by the polymer dots and increased tail absorption by the active layer. Based on single carrier device and impedance measurements, polymer dopant can efficiently decrease charge recombination and improve charge carriers mobilities. The obtained achievements pave an approach of molecular doping in affecting the operation of organic solar cells.
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