High-Performance Narrow Band Gap Terpolymer Enabled Dopant-Free Perovskite Solar Cells
발표자
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초록
내용
The efficiency of perovskite solar cells (PSCs) has recently improved, demanding a variety of capabilities for the charge-transport layers of the future. We adopted a random ternary copolymerization strategy for designing two terpolymers namely, TP-0.8-EG and TP-0.8-TEG comprising benzothiadiazole (BT)-benzo[1,2-b:4,5-b′]dithiophene (BDT)-diketopyrrolo[3,4-c]pyrrole (DPP) backbone. The DPP core maintains the rigidity and planarity of the terpolymer structure. The merits of the narrow band gap TP-0.8-EG terpolymer include high hole mobility and better film formability. Accordingly, the suitable electronic properties of TP-0.8-EG revealed that it can act as a dopant-free hole transporting material (HTM) in PSCs. Remarkably, TP-0.8-EG exhibits a higher power conversion efficiency (PCE) of 20.5% over TP-0.8-TEG (PCE of 18.3%) and BT-UF (PCE of 14.6%), in dopant-free PSCs. Also, the TP-0.8-EG established good device storage stability (85 % of their initial PCEs for 1200 and 500 h).