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New thiophene-based poly(azomethine)s bearing tetraphenylsilane moieties along their backbone. Optical, electronic, thermal properties and theoretical calculations. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109658] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lee SH, Ko SJ, Eom SH, Kim H, Kim DW, Lee C, Yoon SC. Composite Interlayer Consisting of Alcohol-Soluble Polyfluorene and Carbon Nanotubes for Efficient Polymer Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2020; 12:14244-14253. [PMID: 32075367 DOI: 10.1021/acsami.9b22933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the synthesis of composite interlayers using alcohol-soluble polyfluorene (ASP)-wrapped single-walled carbon nanotubes (SWNTs) and their application as electron-transport layers for efficient organic solar cells. The ASP enables the individual dispersion of SWNTs in solution. The ASP-wrapped SWNT solutions are stable for 54 days without any aggregation or precipitation, indicating their very high dispersion stability. Using the ASP-wrapped SWNTs as a cathode interlayer on zinc oxide nanoparticles (ZnO NPs), a power conversion efficiency of 9.45% is obtained in PTB7-th:PC71BM-based organic solar cells, which is mainly attributed to the improvement in the short circuit current. Performance enhancements of 18 and 17% are achieved compared to those of pure ZnO NPs and ASP on ZnO NPs, respectively. In addition, the composite interlayer is applied to non-fullerene-based photovoltaics with PM6:Y6, resulting in a power conversion efficiency of up to 14.37%. The type of SWNT (e.g., in terms of diameter range and length) is not critical to the improvement in the charge-transport properties. A low density of SWNTs in the film (∼1 SWNTs/μm2 for ASP-wrapped SWNTs) has a significant influence on the charge transport in solar cells. The improvement in the performance of the solar cell is attributed to the increased internal quantum efficiency, balanced mobility between electrons and holes, and minimized charge recombination.
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Affiliation(s)
- Seung-Hoon Lee
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Seo-Jin Ko
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Seung Hun Eom
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Hyunjin Kim
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Dong Wook Kim
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Changjin Lee
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
| | - Sung Cheol Yoon
- Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
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