Efficient As-Cast Thick Film Small-Molecule Organic Solar Cell with Less Fluorination on Donor

Kai Wang, Xin Song, Xiao Guo, Wang Yunhao, Xue Lai, Fei Meng, Mengzhen Du, Dongyu Fan, Ren Zhang, Gongqiang Li, Ko Ko Kyaw Aung, Jianpu Wang, Wei Huang, Derya Baran

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Herein, two donors based on fluorine substituted isatin units (DI3T-1F, DI3T-2F) were compared with the mixture of PC71BM for thick-film small molecule solar cells. The devices based on DI3T-1F demonstrate balanced charge transportand less trap-assisted recombination, leading to higher PCE of 8.33% witha thickness ca.150 nm compared to DI3F-2F (PCE of 7.32% with thick film at ca. 160 nm) without additives, solvent or thermal annealing treatments. Both devices based on small molecule:fullerene blends demonstrate good tolerance to active layer thickness from 150 to 300 nm. Our results indicate that less fluorine atoms on donor units can optimize the charge transport, phase-segregated morphology in small molecule solar cells without the need for post-treatment.
Original languageEnglish (US)
Pages (from-to)206-212
Number of pages7
JournalMaterials Chemistry Frontiers
Volume4
Issue number1
DOIs
StatePublished - Nov 14 2019

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