Enhancing the light-harvesting and charge transport properties of polymer solar cells by embedding NaLuF4:Yb,Tm nanorods

In this contribution, we study the effects of NaLuF 4 :Yb,Tm nanorods (NRs) dopant on the performance of inverted polymer bulk heterojunction (BHJ) solar cells. The study allows us to investigate the impact of NRs on the light-harvesting and photocurrent in BHJ solar cells fabricated with PCDTBT ble...

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Main Authors: Zhang, Xinyuan, Zheng, Kezhi, Liu, Chunyu, Li, Hao, Li, Zhiqi, Li, Jinfeng, He, Yeyuan, Guo, Wenbin, Shen, Liang, Ruan, Shengping
Format: Article
Language:English
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Summary:In this contribution, we study the effects of NaLuF 4 :Yb,Tm nanorods (NRs) dopant on the performance of inverted polymer bulk heterojunction (BHJ) solar cells. The study allows us to investigate the impact of NRs on the light-harvesting and photocurrent in BHJ solar cells fabricated with PCDTBT blended with [6,6]-phenyl-C71-butyric acid methylester (PC 71 BM) acceptor. By controlling the doping concentrations, we demonstrate that the power conversion efficiency (PCE) of PCDTBT:PC 71 BM solar cells increases from 6.02% to 7.18% mainly due to improving light absorption and photocurrent. The single carrier devices reveal that the electron and hole mobilities both rise in doped devices, contributing to the enhancement of photoconductivity and consequent PCEs. NaLuF 4 :Yb,Tm NRs were doped in a PCDTBT:PCBM solar cell to improve the current and fill factor, leading to a PCE of 7.175%.
ISSN:2046-2069
DOI:10.1039/c5ra00511f