Alkoxy substitution on simple non‐fused electron acceptors for tuning the photoelectric properties of organic solar cells

密度泛函理论 分子 轨道能级差 有机太阳能电池 烷氧基 接受者 电子受体 计算化学 聚合物太阳能电池 化学 太阳能电池 带隙 马库斯理论 材料科学 电子结构 化学物理 光化学 光电子学 物理 聚合物 烷基 有机化学 反应速率常数 动力学 量子力学 凝聚态物理
作者
Lei Wang,Mingwei Cao,Miao Wang,Huanhuan Gao,Qiong Shi
出处
期刊:International Journal of Quantum Chemistry [Wiley]
卷期号:124 (1) 被引量:1
标识
DOI:10.1002/qua.27254
摘要

Abstract In order to identify high‐performance non‐fused ring electron acceptors for bulk heterojunction (BHJ) solar cells, six structurally diverse molecules are designed and categorized into two series. The first series is anchored by R1 as the reference molecule, featured fixed BDT, IC‐2F end groups and modified π bridges. The second series is anchored by R2 as the reference molecule, incorporated a terminal IC‐2F and a central core modified with EDOT bridge. The electronic structure and photoelectric properties of all acceptor molecules were investigated using density functional theory (DFT) and time‐dependent density functional theory (TD‐DFT). Charge transfer matrix (CTM), Density of states (DOS) and Reorganization energy (RE) etc. were analyzed to provide fundamental knowledge on charge transport and electronic excitation. Among the studied molecules, W2 exhibited a smaller energy gap (1.74 eV) compared to the other molecules, effectively transferring its electron from HOMO to LUMO. At the same time, the W2 molecule has excellent V oc and FF. Furthermore, W2 displayed the largest λ max redshift compared to R1. Although W3 had a smaller value of λ h , the comprehensive photovoltaic parameters of W2 were more excellent. The research results not only demonstrated the feasibility of introducing different alkoxy groups to alter the structure of the π bridge and central core is a feasible method for constructing high‐performance NFREAs, but also highlighted that BDT cores combined with EDOT bridges are among the most promising small molecule acceptors (SMAs) that could be considered as reasonable candidates for synthesis and incorporation into organic solar cells. The results of this study are expected to provide seminal ideas for the design of high‐performance non‐fullerene acceptors.
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