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

7 Scopus citations


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
Issue number1
StatePublished - Nov 14 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: K. Wang and X. Song contributed equally to this work.
Prof. G. Li thanks for the general supported by the National Key R&D Program of China (2017YFA0204704), the National Science Foundation of China (51773091, 61604069, and 61761136013), and Nature Science Foundation of Jiangsu Province (BK20171465);
Prof A. K. Kyaw thanks for general support by Thousand Talents Program of China and Shenzhen Municipal Science and Technology Innovation Committee and Shenzhen Peacock Team Project (No. KQTD2016030111203005).
Prof. D. Baran thanks for the general supported by KAUST Solar Center Competitive Fund (CCF) for financial support.


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