Dithieno[3,2-b:2MODIFIER LETTER PRIME,3MODIFIER LETTER PRIME-d]pyrrol-Fused Asymmetrical Electron Acceptors: A Study into the Effects of Nitrogen-Functionalization on Reducing Nonradiative Recombination Loss and Dipole Moment on Morphology

作者:Gao, W (Gao, Wei)[ 1,2 ] ; Liu, T (Liu, Tao)[ 3,4 ] ; Sun, R (Sun, Rui)[ 5 ] ; Zhang, GY (Zhang, Guangye)[ 6 ] ; Xiao, YQ (Xiao, Yiqun)[ 7 ] ; Ma, RJ (Ma, Ruijie)[ 3,4 ] ; Zhong, C (Zhong, Cheng)[ 2 ] ; Lu, XH (Lu, Xinhui)[ 7 ] ; Min, J (Min, Jie)[ 5 ] ; Yan, H (Yan, He)[ 3,4 ] ; Yang, CL (Yang, Chuluo)[ 1,2 ] ...更少内容

ADVANCED SCIENCE

卷: 7 期: 5

文献号: 1902657

DOI: 10.1002/advs.201902657

出版年:MAR 2020

在线发表日期: JAN 2020

文献类型:Article

摘要

Energy loss (E-loss) consisting of radiative recombination loss (Delta E-1 and Delta E-2) and nonradiative recombination loss (Delta E-3) is considered as an important factor for organic solar cells (OSCs). Herein, two N-functionalized asymmetrical small molecule acceptors (SMAs), namely N7IT and N8IT are designed and synthesized, to explore the effect of N on reducing E-loss with sulfur (S) as a comparison. N7IT-based OSCs achieve not only a higher PCE (13.8%), but also a much lower E-loss (0.57 eV) than those of the analogue (a-IT)-based OSCs (PCE of 11.5% and E-loss of 0.72 eV), which are mainly attributed to N7IT's significantly enhanced charge carrier density (promoting J(SC)) and largely suppressed nonradiative E-loss by over 0.1 eV (enhancing V-OC). In comparison, N8IT, with an extended pi-conjugated length, shows relatively lower photovoltaic performance than N7IT (but higher than a-IT) due to the less favorable morphology caused by the excessively large dipole moment of the asymmetrical molecule. Finally, this work sheds light on the structure-property relationship of the N-functionalization, particularly on its effects on reducing the E-loss, which could inspire the community to design and synthesize more N-functionalized SMAs.

关键词

作者关键词:asymmetrical; dipole moment; energy loss; nonfullerene acceptors; organic solar cells

KeyWords Plus:ORGANIC SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; ENERGY-LEVEL; POLYMER; EFFICIENCY; BENZODITHIOPHENE; DESIGN; UNIT

作者信息

通讯作者地址:

Shenzhen University Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China.

Wuhan University Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.

Hong Kong University of Science & Technology Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China.

Hong Kong University of Science & Technology Hong Kong Univ Sci & Technol, Hong Kong Branch, Kowloon, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Clear Water Bay, Hong Kong 999077, Peoples R China.

Wuhan University Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

Chinese University of Hong Kong Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China.

通讯作者地址: Yang, CL (通讯作者)

Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China.

通讯作者地址: Yang, CL (通讯作者)

Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.

通讯作者地址: Liu, T; Yan, H (通讯作者)

Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China.

通讯作者地址: Liu, T; Yan, H (通讯作者)

Hong Kong Univ Sci & Technol, Hong Kong Branch, Kowloon, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Clear Water Bay, Hong Kong 999077, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

通讯作者地址: Lu, XH (通讯作者)

Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China.

地址:

[ 1 ]‎ Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China

[ 2 ]‎ Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China

[ 3 ]‎ Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China

[ 4 ]‎ Hong Kong Univ Sci & Technol, Hong Kong Branch, Kowloon, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Clear Water Bay, Hong Kong 999077, Peoples R China

[ 5 ]‎ Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China

[ 6 ]‎ eFlexPV Ltd China, Shenzhen 518000, Peoples R China

[ 7 ]‎ Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China

电子邮件地址:liutaozhx@ust.hk; xhlu@phy.cuhk.edu.hk; min.jie@whu.edu.cn; hyan@ust.hk; clyang@whu.edu.cn