Efficient ternary organic solar cells with energy cascade and Foerster resonance energy transfer by doping phosphorescent small molecule

Geng Feng; Pu Fan; Yingying Yuan; Qinxue Li; Jian Zhong

doi:10.1117/12.2507705

8 February 2019 Efficient ternary organic solar cells with energy cascade and Foerster resonance energy transfer by doping phosphorescent small molecule

Geng Feng, Pu Fan, Yingying Yuan, Qinxue Li, Jian Zhong

Author Affiliations +

Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 108431N (2019) https://doi.org/10.1117/12.2507705
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

In this work, we fabricated the ternary bulk hetero junction (BHJ) polymer solar cells (PSCs) by doping a phosphorescent small molecule bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′] iridium(acetylacetonate)[(tbt)₂Ir(acac)] into the conventional active layer of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). After doping (tbt)₂Ir(acac), the short circuit current and fill factor are simultaneously enhanced compared with binary device and the power conversion efficiency (PCE) of P3HT:PC₇₁BM based ternary devices is improved from 2.99% to 4.14%. More excellent photovoltaic performance of ternary PSCs is mainly attributed to enhanced charge transportation by appropriate energy cascade alignment and enhanced exciton harvesting by Foerster resonance energy transfer from (tbt)2Ir(acac) to P3HT.

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Geng Feng, Pu Fan, Yingying Yuan, Qinxue Li, and Jian Zhong "Efficient ternary organic solar cells with energy cascade and Foerster resonance energy transfer by doping phosphorescent small molecule", Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 108431N (8 February 2019); https://doi.org/10.1117/12.2507705

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KEYWORDS

Solar cells

Solar energy

Polymers

Doping

Organic photovoltaics

Molecules

Resonance energy transfer

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