Over 18.2％efficiency of layer-by-layer all-polymer solar cells enabled by homoleptic iridium(Ⅲ)carbene complex as solid additive

Hang Zhou ¹Yingjie Sun ²Miao Zhang ²Yuheng Ni ¹Fenghua Zhang ³Sang Young Jeong ⁴Tianhuan Huang ⁵Xiong Li ³Han Young Woo ⁴Jian Zhang ⁵Wai-Yeung Wong ²Xiaoling Ma ⁶Fujun Zhang⁶

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作者信息

1. Key Laboratory of Luminescence and Optical Information,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China
2. Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong 999077,China
3. Department of Physics,Beijing Technology and Business University,Beijing,100048,China
4. Organic Optoelectronic Materials Laboratory,Department of Chemistry,College of Science,Korea University,Seoul 02841,Republic of Korea
5. School of Materials Science and Engineering,Engineering Research Center of Electronic Information Materials and Devices,Ministry of Education,Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,China
6. Key Laboratory of Luminescence and Optical Information(Ministry of Education),Beijing Jiaotong University,Beijing 100044,China;Tangshan Research Institute of Beijing Jiaotong University,Tangshan 063000,China
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Abstract

The vertical phase distribution of active layers plays a vital role in balancing exciton dissociation and charge transport for achieving efficient polymer solar cells(PSCs).The layer-by-layer(LbL)PSCs are com-monly prepared by using sequential spin-coating method from donor and acceptor solutions with dis-tinct solvents and solvent additives.The enhanced exciton dissociation is expected in the LbL PSCs with efficient charge transport in the relatively neat donor or acceptor layers.In this work,a series of LbL all-polymer solar cells(APSCs)were fabricated with PM6 as donor and PY-DT as acceptor,and triplet material m-Ir(CPmPB)3 is deliberately incorporated into PY-DT layer to prolong exciton lifetimes of active layers.The power conversion efficiency(PCE)of LbL APSCs is improved to 18.24％from 17.32％by incorporating 0.3 wt％m-Ir(CPmPB)3 in PY-DT layer,benefiting from the simultaneously enhanced short-circuit current density(Jsc)of 25.17 mA cm-2 and fill factor(FF)of 74.70％.The enhancement of PCE is attributed to the efficient energy transfer of m-Ir(CPmPB)3 to PM6 and PY-DT,resulting in the prolonged exciton lifetime in the active layer and the increased exciton diffusion distance.The efficient energy transfer from m-Ir(CPmPB)3 to PM6 and PY-DT layer can be confirmed by the increased photo-luminescence(PL)intensity and the prolonged PL lifetime of PM6 and PY-DT in PM6+m-Ir(CPmPB)3 and PY-DT+m-Ir(CPmPB)3 films.This study indicates that the triplet material as solid additive has great potential in fabricating efficient LbL APSCs by prolonging exciton lifetimes in active layers.

Key words

Layer-by-layer/All-polymer solar cells/Additive strategy/Triplet material/Energy transfer

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基金项目

Beijing Natural Science Foundation(4232073)

Beijing Natural Science Foundation(1232029)

National Natural Science Foundation of China(62175011)

National Natural Science Foundation of China(62105017)

National Natural Science Foundation of China(62205276)

National Natural Science Foundation of China(5231101105)

Natural Science Foundation of Hebei Province(F2023105002)

National Research Foundation of Korea(2023K2A9A2A06059546)

Hong Kong Research Grants Council(PolyU 15307321)

RGC Senior Research Fellowship Scheme(SRFS2021-5S01)

Research Institute for Smart Energy(CDAQ)()

Ms.Clarea Au for the Endowed Professorship in Energy(847S)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

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