14.58% Efficiency Semi-Transparent Quasi-Layered Polymer Solar Cells by Incorporating Trace High Hole Mobility and Crystallinity Material

초록

A series of opaque and semi-transparent quasi-layered polymer solar cells (QL-PSCs) was constructed by a sequential spin-coating method, with D18 featuring a wide optical bandgap and narrow absorption range as donor and BTP-eC9 having self-dissociation characteristics as acceptor. The material C8-BTBT with high hole mobility and crystallinity is deliberately added into BTP-eC9 layers to improve hole transport in BTP-eC9 layers. The power conversion efficiency (PCE) of opaque QL-PSCs is enhanced from 18.20% to 18.90% by adding 0.03 wt.% C8-BTBT into BTP-eC9 layers, benefiting from the enhanced short-circuit current density (J SC) of 28.30 mA cm-2 and fill factor (FF) of 75.69%. The semi-transparent QL-PSCs were optimized by adjusting the D18 layer thickness and employing Au (1nm)/Ag (10 nm) as electrode, light-utilization-efficiency (LUE) of 3.96% of optimal semi-transparent QL-PSCs can be achieved with a PCE of 14.58% and an average visible transmittance (AVT) of 27.19%. This work indicates that the quasi-layered (QL) strategy accompanied with trace high hole mobility and crystallinity material may provide great potential in achieving high efficient semi-transparent QL-PSCs.

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