Design of Fused Cyclopentadithiophene Core-based Polymer Donor for Exceptional Light Utilization in Semi-transparent Organic Solar Cells
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초록
내용
Semi-transparent organic solar cells (ST-OSCs) have attracted significant attention for various applications such as building-integrated photovoltaics, smart window technologies, and so on. To construct highly efficient ST-OSC configurations, both the donors and acceptors in photoactive layers are required to absorb the NIR region while remaining transparent in the visible region. In this study, new polymer donors PL1 and PL2 are designed and synthesized for the fabrication of efficient ST-OSCs. Especially, bulk-heterojunction OSCs reach power conversion efficiencies (PCEs) of 10.12% and 11.62% for PL2:Y6 binary and PL2:Y6:PC61BM ternary blends, respectively. Most significantly, the ternary blend yields a PCE of 9.91%, AVT of 40.4%, and LUE of 4.00% in ST-OSCs. This work provides an efficient molecular design strategy that can be used to optimize narrow bandgap polymer properties and offers an insight for improving the efficiencies of ST-OSCs.