Introducing Porphyrin Units by Random Copolymerization Into NDI-Based Acceptor for All Polymer Solar Cells

Jinliang Liu; Mengzhen Li; Dong Chen; Bin Huang; Qiannan He; Shanshan Ding; Wenquan Xie; Feiyan Wu; Lie Chen; Yiwang Chen

doi:10.3389/fchem.2020.00310

Introducing Porphyrin Units by Random Copolymerization Into NDI-Based Acceptor for All Polymer Solar Cells

Front Chem. 2020 Apr 28:8:310. doi: 10.3389/fchem.2020.00310. eCollection 2020.

Authors

Jinliang Liu¹, Mengzhen Li¹, Dong Chen¹, Bin Huang¹, Qiannan He¹, Shanshan Ding¹, Wenquan Xie¹, Feiyan Wu¹, Lie Chen¹, Yiwang Chen^{1

2}

Affiliations

¹ College of Chemistry, Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang, China.
² Institute of Advanced Scientific Research (IASR), Jiangxi Normal University, Nanchang, China.

Abstract

Naphthalene diimide (NDI)-based polymer N2200 is a promising organic polymer acceptor for all-polymer solar cells (all-PSCs), but its inherent shortcomings like poor extinction coefficient and strong aggregation limit further performance optimization of all-PSCs. Here, a series of random copolymers, PNDI-Px, were designed and synthesized by introducing porphyrin unit into NDI-based polymer as acceptors for all-PSCs. These random copolymers show a higher absorption coefficient and raised the lowest unoccupied molecular orbital (LUMO) energy levels compared to N2200. The crystallinity can also be fine-tuned by regulation of the content of porphyrin unit. The random copolymers are matched with polymer donor PBDB-T for the application in all-polymer solar cells. The best power conversion efficiency (PCE) of these PNDI-Px-based devices is 5.93%, ascribed to the overall enhanced device parameters compared with the N2200-based device. These results indicate that introducing porphyrin unit into polymer is a useful way to fine-tune the photoelectric performance for efficient all-PSCs.

Keywords: all-polymer solar cells; device performance; naphthalene diimide; porphyrin; random copolymerization.