TY - JOUR
T1 - Enhancing the performance of a fused-ring electron acceptor via extending benzene to naphthalene
AU - Zhu, Jingshuai
AU - Wu, Yang
AU - Rech, Jeromy
AU - Wang, Jiayu
AU - Liu, Kuan
AU - Li, Tengfei
AU - Lin, Yuze
AU - Ma, Wei
AU - You, Wei
AU - Zhan, Xiaowei
N1 - Funding Information:
X. Z. thanks NSFC (21734001). Y. L. thanks NSFC (21504058) and Scientific Research Project of Beijing Educational Committee (KM201610028006). W. M. thanks NSFC (21504066, 21534003) and the Ministry of Science and Technology of China (2016YFA0200700). W. Y. thanks NSF (DMR-1507249 and CBET-1639429). X-ray data were acquired at beamlines 7.3.3 and 11.0.1.2 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2017/11
Y1 - 2017/11
N2 - We compared an indacenodithiophene(IDT)-based fused-ring electron acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π-π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: -3.75 eV, IDIC1: -3.81 eV) and a higher electron mobility (IHIC1: 3.0 × 10-4 cm2 V-1 s-1, IDIC1: 1.5 × 10-4 cm2 V-1 s-1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance electron mobility, and finally achieve higher efficiency in nonfullerene acceptor-based OSCs.
AB - We compared an indacenodithiophene(IDT)-based fused-ring electron acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π-π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: -3.75 eV, IDIC1: -3.81 eV) and a higher electron mobility (IHIC1: 3.0 × 10-4 cm2 V-1 s-1, IDIC1: 1.5 × 10-4 cm2 V-1 s-1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance electron mobility, and finally achieve higher efficiency in nonfullerene acceptor-based OSCs.
UR - http://www.scopus.com/inward/record.url?scp=85039166497&partnerID=8YFLogxK
U2 - 10.1039/c7tc04520d
DO - 10.1039/c7tc04520d
M3 - Journal article
AN - SCOPUS:85039166497
SN - 2050-7526
VL - 6
SP - 66
EP - 71
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 1
ER -