Isoindigo-dicyanobithiophene-Based Copolymer for High Performance Polymer-Fullerene Solar Cells Reaching 1.06 v Open Circuit Voltage and 8.36% Power Conversion Efficiency
Journal
ACS Macro Letters
Journal Volume
6
Journal Issue
9
Pages
969
Date Issued
2017-09-19
Author(s)
Abstract
© 2017 American Chemical Society. To investigate the effect of substitution of cyano groups (CN) on D-π-A type conjugated copolymer in photophysical and photovoltaic properties, a non-CN-substituted P4TIH and a CN-substituted P4TIN isoindigo-based copolymers were synthesized and characterized. Having dicyano-substituted bithiophene as electron-donating segment and isoindigo as electron-accepting segment, P4TIN exhibits a deeper highest occupied molecular orbital energy level (HOMO) than that of the non-CN-substituted P4TIH. Benefiting from the improved solubility via copolymer side-chain substituent (2-decylteradecyl), inverted solar cells fabricated with a thick (∼200 nm) active layer (P4TIN:PC61BM, 1:2.0) have achieved a very high open circuit voltage of 1.06 V. High power conversion efficiency of 8.36% can be reached without thermal annealing treatment or processing solvent additives.
SDGs
Other Subjects
Conversion efficiency; Molecular orbitals; Open circuit voltage; Organic polymers; Photovoltaic effects; Polymer solar cells; Timing circuits; Conjugated copolymers; Effect of substitution; High performance polymer; High power conversion; Highest occupied molecular orbital energy levels; Photovoltaic property; Power conversion efficiencies; Thermal annealing treatment; Solar cells
Publisher
AMER CHEMICAL SOC
Type
journal article