Premium
Identifying the Electrostatic and Entropy‐Related Mechanisms for Charge‐Transfer Exciton Dissociation at Doped Organic Heterojunctions
Author(s) -
Xue Wenyue,
Tang Yabing,
Zhou Xiaobo,
Tang Zheng,
Zhao Hanzhang,
Li Tao,
Zhang Lu,
Liu Shengzhong Frank,
Zhao Chao,
Ma Wei,
Yan Han
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101892
Subject(s) - heterojunction , homojunction , materials science , doping , exciton , organic solar cell , optoelectronics , acceptor , dissociation (chemistry) , electric field , chemical physics , nanotechnology , condensed matter physics , chemistry , physics , polymer , quantum mechanics , composite material
The electron donor/acceptor (D/A) heterojunction is the core for photocharge generation and recombination in organic photovoltaics (OPVs). Developing practical methods for the D/A heterojunction modification remains challenging and is rarely discussed in OPV research. Herein, the roles of molecular doping at the D/A heterojunction in the charge‐transfer exciton dissociation and detailed energy loss are investigated, and new insights are gained into the functions of doping on the OPV performance. Heterojunction doping simultaneously enhances all three OPV parameters, especially the short‐circuit current ( J sc ). It is shown that the J sc improvement is due to the combined effects of strengthened electric field and reduced activation energy, which is regulated via an entropy‐related mechanism. The performance enhancement is further demonstrated in homojunction devices showing the great potential of interfacial doping to overcome the intrinsic limitation between high J sc and open‐circuit voltage ( V oc ) in OPVs.