Preprint Article Version 1 This version is not peer-reviewed

Region Asymmetric Polymers Based on Fluorinated Benzothiadiazole-Benzodithiophene for Polymer Solar Cells with High Open-Circuit Voltage

Version 1 : Received: 13 December 2018 / Approved: 14 December 2018 / Online: 14 December 2018 (09:56:13 CET)

How to cite: Liu, C.; Gan, G.; Li, Z.; Sun, N.; Li, X.; Tong, Y.; Wang, H.; Hao, Y. Region Asymmetric Polymers Based on Fluorinated Benzothiadiazole-Benzodithiophene for Polymer Solar Cells with High Open-Circuit Voltage. Preprints 2018, 2018120172 (doi: 10.20944/preprints201812.0172.v1). Liu, C.; Gan, G.; Li, Z.; Sun, N.; Li, X.; Tong, Y.; Wang, H.; Hao, Y. Region Asymmetric Polymers Based on Fluorinated Benzothiadiazole-Benzodithiophene for Polymer Solar Cells with High Open-Circuit Voltage. Preprints 2018, 2018120172 (doi: 10.20944/preprints201812.0172.v1).

Abstract

Two region asymmetric polymers PR2F and PR1F with three repeat units of A-D-A, π-D-A, and π-D-π along the polymer backbone were attained by polymerizing different fluorinated benzothiadiazole-thiophene units, FBT-T and 2FBT-T units (A–π), with benzodithiophene unit (D), respectively. Here, the new region asymmetric polymers were in contrast to the traditional polymers featuring a D–A or D–π–A–π backbone. Both the region asymmetric polymers showed a low lying of HOMO energy level in relation to that of the PC61BM acceptor and then obtained the high open-circuit voltage of ~1 V in both PR2F and PR1F devices. Bulk-heterojunction devices based on PR2F with difluorinated BT exhibited an appreciable power conversion efficiency (PCE) of 4.73% due to the relatively high and balanced charge carrier mobilities, while the mono-fluorinated BT polymer PR1F-based devices gave a lower PCE of 2.92%. These results indicate that the region asymmetric conjugated polymer is a promising class of materials for polymer solar cell applications, and it is significant to further understand the influence of polymer structure on optoelectronic properties.

Subject Areas

polymer solar cells; region asymmetric polymers; fluorinated benzothiadiazole

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