Premium
Designing Nonfullerene Acceptors with Oligo(Ethylene Glycol) Side Chains: Unraveling the Origin of Increased Open‐Circuit Voltage and Balanced Charge Carrier Mobilities
Author(s) -
Cui Junjie,
Park JungHwa,
Kim Dong Won,
Choi MinWoo,
Chung Hae Yeon,
Kwon Oh Kyu,
Kwon Ji Eon,
Park Soo Young
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202100660
Subject(s) - acceptor , ethylene glycol , materials science , stacking , side chain , organic solar cell , electron mobility , charge carrier , open circuit voltage , triethylene glycol , optoelectronics , polymer , chemistry , polymer chemistry , voltage , organic chemistry , electrical engineering , physics , engineering , composite material , condensed matter physics
Abstract Despite the recent rapid development of organic solar cells (OSCs), the low dielectric constant ( ϵ r =3–4) of organic semiconducting materials limits their performance lower than inorganic and perovskite solar cells. In this work, we introduce oligo(ethylene glycol) (OEG) side chains into the dicyanodistyrylbenzene‐based non‐fullerene acceptors (NIDCS) to increase its ϵ r up to 5.4. In particular, a NIDCS acceptor bearing two triethylene glycol chains (NIDCS‐EO3) shows V OC as high as 1.12 V in an OSC device with a polymer donor PTB7, which is attributed to reduced exciton binding energy of the blend film. Also, the larger size grain formation with well‐ordered stacking structure of the NIDCS‐EO3 blend film leads to the increased charge mobility and thus to the improved charge mobility balance, resulting in higher J SC , FF , and PCE in the OSC device compared to those of a device using the hexyl chain‐based NIDCS acceptor (NIDCS‐HO). Finally, we fabricate NIDCS‐EO3 devices with various commercial donors including P3HT, DTS‐F, and PCE11 to show higher photovoltaic performance than the NIDCS‐HO devices, suggesting versatility of NIDCS‐EO3.