Simultaneous Increase in Open-Circuit Voltage and Efficiency of Fullerene-Free Solar Cells through Chlorinated Thieno[3,4-b]thiophene Polymer Donor

Wang, Huan; Chao, Pengjie; Chen, Hui; Mu, Zhao; Chen, Wei; He, Feng

doi:10.1021/acsenergylett.7b00551

Simultaneous Increase in Open-Circuit Voltage and Efficiency of Fullerene-Free Solar Cells through Chlorinated Thieno[3,4-b]thiophene Polymer Donor

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b00551· OSTI ID:1373484

Wang, Huan ^[1]; Chao, Pengjie ^[2]; Chen, Hui ^[2]; Mu, Zhao ^[2]; ^[3]; He, Feng ^[2]

Southern Univ. of Science and Technology, Shenzhen (People's Republic of China); Institute for Molecular Engineering and Materials Science Division, Argonne National Laboratory
Southern Univ. of Science and Technology, Shenzhen (People's Republic of China)
Argonne National Lab. (ANL), Lemont, IL (United States); The Univ. of Chicago, Chicago, IL (United States)

Here, the chlorinated polymer, PBTCl, have been found to be an efficient donor in non-fullerene PSCs, which showed a blue-shifted absorbance compared to that of its fluorine analog (PTB7-th), and resulted in a more complementary light absorption with non-fullerene acceptor, such as ITIC. Meanwhile, chlorine substitution lowered the HOMO level of PBTCl, which increased the open-circuit voltage of the corresponding polymer-based devices. The 2D GIWAXS analysis illustrated that the PBTCl/ITIC blend film exhibited a “face-on” orientation and scattering features of both PBTCl and ITIC, suggesting that the blend of PBTCl and ITIC was phase separated and formed individual crystalline domains of the donor and acceptor, which promoted charge transfer in the bi-continuous film and eventually elevated the solar energy conversion efficiency. The PBTCl-based non-fullerene PSC exhibited a maximum PCE of 7.57% with a Voc of 0.91 V, which was an approximately 13% increasing in the PCE compared to the fluorine-analog-based device.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Institute for Molecular Engineering and Materials Science Division

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1373484

Alternate ID(s):: OSTI ID: 1374877

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 2; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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