14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference

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14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference. / Yao, Huifeng; Cui, Yong; Qian, Deping; Ponseca, Carlito S.; Honarfar, Alireza; Xu, Ye; Xin, Jingming; Chen, Zhenyu; Hong, Ling; Gao, Bowei; Yu, Runnan; Zu, Yunfei; Ma, Wei; Chabera, Pavel; Pullerits, Tönu; Yartsev, Arkady; Gao, Feng; Hou, Jianhui.

In: Journal of the American Chemical Society, Vol. 141, No. 19, 2019, p. 7743-7750.

Research output: Contribution to journalArticle

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Yao, Huifeng ; Cui, Yong ; Qian, Deping ; Ponseca, Carlito S. ; Honarfar, Alireza ; Xu, Ye ; Xin, Jingming ; Chen, Zhenyu ; Hong, Ling ; Gao, Bowei ; Yu, Runnan ; Zu, Yunfei ; Ma, Wei ; Chabera, Pavel ; Pullerits, Tönu ; Yartsev, Arkady ; Gao, Feng ; Hou, Jianhui. / 14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference. In: Journal of the American Chemical Society. 2019 ; Vol. 141, No. 19. pp. 7743-7750.

RIS

TY - JOUR

T1 - 14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference

AU - Yao, Huifeng

AU - Cui, Yong

AU - Qian, Deping

AU - Ponseca, Carlito S.

AU - Honarfar, Alireza

AU - Xu, Ye

AU - Xin, Jingming

AU - Chen, Zhenyu

AU - Hong, Ling

AU - Gao, Bowei

AU - Yu, Runnan

AU - Zu, Yunfei

AU - Ma, Wei

AU - Chabera, Pavel

AU - Pullerits, Tönu

AU - Yartsev, Arkady

AU - Gao, Feng

AU - Hou, Jianhui

PY - 2019

Y1 - 2019

N2 - Although significant improvements have been achieved for organic photovoltaic cells (OPVs), the top-performing devices still show power conversion efficiencies far behind those of commercialized solar cells. One of the main reasons is the large driving force required for separating electron-hole pairs. Here, we demonstrate an efficiency of 14.7% in the single-junction OPV by using a new polymer donor PTO2 and a nonfullerene acceptor IT-4F. The device possesses an efficient charge generation at a low driving force. Ultrafast transient absorption measurements probe the formation of loosely bound charge pairs with extended lifetime that impedes the recombination of charge carriers in the blend. The theoretical studies reveal that the molecular electrostatic potential (ESP) between PTO2 and IT-4F is large, and the induced intermolecular electric field may assist the charge generation. The results suggest OPVs have the potential for further improvement by judicious modulation of ESP.

AB - Although significant improvements have been achieved for organic photovoltaic cells (OPVs), the top-performing devices still show power conversion efficiencies far behind those of commercialized solar cells. One of the main reasons is the large driving force required for separating electron-hole pairs. Here, we demonstrate an efficiency of 14.7% in the single-junction OPV by using a new polymer donor PTO2 and a nonfullerene acceptor IT-4F. The device possesses an efficient charge generation at a low driving force. Ultrafast transient absorption measurements probe the formation of loosely bound charge pairs with extended lifetime that impedes the recombination of charge carriers in the blend. The theoretical studies reveal that the molecular electrostatic potential (ESP) between PTO2 and IT-4F is large, and the induced intermolecular electric field may assist the charge generation. The results suggest OPVs have the potential for further improvement by judicious modulation of ESP.

U2 - 10.1021/jacs.8b12937

DO - 10.1021/jacs.8b12937

M3 - Article

C2 - 31017418

AN - SCOPUS:85065791685

VL - 141

SP - 7743

EP - 7750

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 1520-5126

IS - 19

ER -