Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 12, Issue -, Pages 1401-1409Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.12.134
Keywords
carbazole polymer; hole transport; perovskite solar cell; polycondensation
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Funding
- JSPS KAKENHI [26620173]
- Kurata Memorial Hitachi Science and Technology Foundation
- Tokuyama Science Foundation
- Support for Tokyotech Advanced Researchers
- Tochigi Industrial Promotion Center
- Grants-in-Aid for Scientific Research [16K13974, 26620173] Funding Source: KAKEN
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The ever increasing demand for clean energy has encouraged researchers to intensively investigate environmentally friendly photovoltaic devices. Inorganic-organic hybrid perovskite solar cells (PSCs) are very promising due to their potentials of easy fabrication processes and high power conversion efficiencies (PCEs). Designing hole-transporting materials (HTMs) is one of the key factors in achieving the high PCEs of PSCs. We now report the synthesis of two types of carbazole-based polymers, namely 3,6-Cbz-EDOT and 2,7-Cbz-EDOT, by Stille polycondensation. Despite the same chemical composition, 3,6-Cbz-EDOT and 2,7-Cbz-EDOT displayed different optical and electrochemical properties due to the different connectivity mode of the carbazole unit. Therefore, their performances as hole-transporting polymeric materials in the PSCs were also different. The device based on 2,7-Cbz-EDOT showed better photovoltaic properties with the PCE of 4.47% than that based on 3,6-Cbz-EDOT. This could be due to its more suitable highest occupied molecular orbital (HOMO) level and higher hole mobility.
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