Isomeric Small Molecule Donor with Terminal Branching Position Directly Attached to the Backbone Enables Efficient All‐Small‐Molecule Organic Solar Cells with Excellent Stability
作者:Hong‐Fu Zhi、Mengyun Jiang、Heng Zhang、Qiaoshi An、Hai‐Rui Bai、Min Hun Jee、Han Young Woo、Danwei Li、Xuebin Huang、Jin‐Liang Wang
DOI:10.1002/adfm.202300878
日期:——
All-small-molecule organic solar cells (ASM-OSCs) are challenging for their inadequate efficiency and device stability due to their more susceptive morphology. Herein, a family of isomeric small molecule donors (SMDs) is synthesized based on the benzodithiophene–terthiophene core with linear, 1st carbon, and 2nd carbon position branched butyl-based rhodanine for ASM-OSCs, respectively. The single crystal of thiophene-substituted
全小分子有机太阳能电池 (ASM-OSC) 由于其更敏感的形态而导致效率和器件稳定性不足,因此面临挑战。在此,基于苯并二噻吩-三联噻吩核,分别为 ASM-OSC 合成了一个异构小分子供体 (SMD) 家族,具有线性、第一个碳和第二个碳位置支链的丁基绕丹宁。噻吩取代模型T- s -Bu的单晶形成了比基于滑层堆积的T - n -Bu和T- i -Bu更致密的人字形结构分子间堆积。SM- i -Bu和SM- s -Bu与SM- n -Bu相比,在纯薄膜中显示出轻微的蓝移吸收和加深的 HOMO 能级。SM- s -Bu:BO-4Cl混合薄膜具有明显的正面堆积取向和合适的纤维相分离以及更明显的微晶。最后,基于SM- s -Bu : BO-4Cl的器件的功率转换效率提高了 16.06%,而SM- n -Bu : BO-4Cl和SM- i -Bu : BO-4Cl 的功率转换效率分别为 15.12% 和