Combining chlorination and sulfuration strategies for high-performance all-small-molecule organic solar cells

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 228-233
• 页数: 6页
• 语种: 英文

摘要

Three small-molecule donors based on dithieno[2,3-d:2',3'-d']-benzo[1,2-b:4,5-b']dithiophene(DTBDT)unit were designed and synthesized by side chain regulation with chlorinated or/and sulfurated substi-tutions(namely ZR1,ZR1-Cl,and ZR1-S-Cl respectively),along with a crystalline non-fullerene acceptor IDIC-4Cl with a chlorinated 1,1-dicyanomethylene-3-indanone(IC)end group.Energy levels,molar extinction coefficients and crystallinities of three donor molecules can be effectively altered by combin-ing chlorination and sulfuration strategies.Especially,the ZR1-S-Cl exhibited the best absorption ability,lowest higher occupied molecular orbital(HOMO)energy level and highest crystallinity among three donors,resulting in the corresponding all-small-molecule organic solar cells to produce a high power conversion efficiency(PCE)of 12.05％with IDIC-4Cl as an acceptor.