Medium band-gap non-fullerene acceptors based on a benzothiophene donor moiety enabling high-performance indoor organic photovoltaics

Li, Xiaojun1,2,3,4; Luo, Siwei1,2,3,5; Sun, Huiliang6,7; Sung, Herman Ho-Yung8; Yu, Han1,2,3,5; Liu, Tao1,2,3,5; Xiao, Yiqun9; Bai, Fujin1,2,3,5; Pan, Mingao1,2,3,5; Lu, Xinhui9; Williams, Ian Duncan8; Guo, Xugang6; Li, Yongfang4; Yan, He1,2,3,5

2021-07-01

10.1039/d1ee00687h

Energy & Environmental Science   影响因子和分区

1754-5692

1754-5706

Organic photovoltaics (OPVs) are one of the most promising technologies to power indoor electronic devices. However, the limited types and design strategies of medium band-gap acceptor materials hinder the development of indoor OPVs. Currently, the state-of-the-art non-fullerene acceptors (NFAs) are Y6 and its derivatives, which are based on an A-DA ' D-A structure. In this paper, we report the modification of the Y6 structure by replacing Y6's D unit (thieno[3,2-b]thiophene) with benzothiophene, and synthesize two novel NFAs (LBT-DF and LBT-SCl) for indoor applications. The use of the benzothiophene unit reduces the intermolecular charge transfer effect, thus blue-shifting the absorption spectra and up-shifting the LUMO energy levels of the NFAs. As a result, LBT-SCl achieves a higher V-oc and thus PCE (up to 25.1%) than Y6 (22.2%) under indoor conditions. Interestingly, these two NFAs exhibit a non-planar aromatic structure, which is rarely observed in the published NFAs, because a better coplanar molecular configuration is usually considered as the critical factor in realizing high PCE. Different from the above mentioned molecular design concept, we find that non-planar structure acceptors also have great potential in OPVs. Our work provides an effective OPV material design guideline for developing high-performance indoor OPVs and also opens a new direction for the design of NFAs.

SCI ; EI

英语

通讯

National Key Research and Development Program of China - MOST[2019YFA0705900] ; Basic and Applied Basic Research Major Program of Guangdong Province[2019B030302007] ; Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials[2019B121205002] ; Shen Zhen Technology and Innovation Commission["JCYJ2017041 3173814007","JCYJ20170818113905024"] ; Hong Kong Research Grants Council["R6021-18","C6023-19G",16309218,16310019,16303917] ; Hong Kong Innovation and Technology Commission["ITC-CNERC14SC01","ITS/471/18"] ; National Natural Science Foundation of China (NSFC)[91433202]

Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology

Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences

WOS:000673009400001

ROYAL SOC CHEMISTRY

20213410802850

Blue shift ; Charge transfer ; Chlorine compounds ; Fullerenes ; Thiophene

Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Organic Compounds:804.1

Web of Science

1.Hong Kong Univ Sci & Technol, Shenzhen Res Inst, 9 Yuexing First RD,Hitech Pk, Shenzhen 518057, Peoples R China
2.Hong Kong Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Optoelect & M, Dept Chem, Energy Inst,Kowloon, Clear Water Bay, Hong Kong, Peoples R China
3.Hong Kong Univ Sci & Technol, Hong Kong Branch, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
4.Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
5.South China Univ Technol SCUT, State Key Lab Luminescent Mat & Devices, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China
6.Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
7.Guangzhou Univ, Ctr Adv Analyt Sci, Sch Chem & Chem Engn, Guangzhou 510006, Peoples R China
8.Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong, Peoples R China
9.Chinese Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China

Li, Xiaojun,Luo, Siwei,Sun, Huiliang,et al. Medium band-gap non-fullerene acceptors based on a benzothiophene donor moiety enabling high-performance indoor organic photovoltaics[J]. Energy & Environmental Science,2021,14:4555-4563.

Li, Xiaojun.,Luo, Siwei.,Sun, Huiliang.,Sung, Herman Ho-Yung.,Yu, Han.,...&Yan, He.(2021).Medium band-gap non-fullerene acceptors based on a benzothiophene donor moiety enabling high-performance indoor organic photovoltaics.Energy & Environmental Science,14,4555-4563.

Li, Xiaojun,et al."Medium band-gap non-fullerene acceptors based on a benzothiophene donor moiety enabling high-performance indoor organic photovoltaics".Energy & Environmental Science 14(2021):4555-4563.