Side Chain Engineering on Non-Fullerene Acceptor for Organic Solar Cells
발표자
()
초록
내용
Since non-fullerene acceptor (NFA) materials with low optical bandgap appeared, organic solar cells (OSCs) began to show high power conversion efficiencies (PCEs). We designed two derivatives of Y-series NFAs. The two NFAs were synthesized with the n-hexyl side chain on triazole moiety with (BTA-UD-4F) and without (BTA-4F) alkyl side chain. BTA-UD-4F with alkyl side chain exhibited the highest occupied molecular orbital and lowest unoccupied molecular orbital of 5.40 and 3.91 eV, respectively. Therefore, BTA-4F blended with polymer PM7 exhibited a PCE of 8.26 %, open-circuit voltage (Voc) of 0.76 V, a short-circuit current density (Jsc) of 18.04 mA/cm2, and fill factor (FF) of 62.23%. BTA-UD-4F blended with polymer PM7 exhibited a PCE of 9.12 %, Voc of 0.71 V, Jsc) of 21.08 mA/cm2, and FF of 62.04%. BTA-UD-4F showed better device performance and higher solubility compared to BTA-4F.