Design and Synthesis of a Novel n‐Type Polymer Based on Asymmetric Rylene Diimide for the Application in All‐Polymer Solar Cells

Abstract

A novel n-type polymer of PTDI-T based on asymmetric rylene diimide and thiophene is designed and synthesized. The highest power conversion efficiency of 4.70% is achieved for PTB7-Th:PTDI-T-based devices, which is obviously higher than those of the analogue polymers of PPDI-2T and PDTCDI. When using PBDB-T as a donor, an open-circuit voltage (V ) as high as 1.03 V is obtained. The results indicate asymmetric rylene diimide is a kind of promising building block to construct n-type photovoltaic polymers.

Perylene Diimide‐Based Conjugated Polymers for All‐Polymer Solar Cells

“…In 2018, Zhou et al. developed the thienyl semicoronene PDI‐based polymer C3 . A relatively low PCE of 4.70 % was achieved because of the uniform film morphology due to the unsymmetrical structure of C3 .…”

An Analysis of the Factors Determining the Efficiency of Photocurrent Generation in Polymer:Nonfullerene Acceptor Solar Cells

“…Over last 3 years, NFA‐based OSC performance has improved remarkably, with several studies reporting efficiencies over 13% driven primarily through improved molecular design . Particular progress has been made in enhancing the open circuit voltage ( V OC ) of OSCs, achieved by use of NFAs with higher the lowest unoccupied molecular orbital (LUMO) levels as well as suppression of nonradiative recombination losses . However, progress in achieving improvements in photocurrent generation has proven more challenging, despite NFAs typically exhibiting superior light‐harvesting properties compared to fullerene acceptors .…”

Aromatic‐Diimide‐Based n‐Type Conjugated Polymers for All‐Polymer Solar Cell Applications

“…In 2013, Zhan synthesized a series of n‐type polymers (PDTCDI) based on dithienocoronene diimide (DTCDI) and different number of thiophene units and PCEs of 0.31–0.84% were obtained . In 2017, Yang and co‐workers synthesized a novel n‐type polymer PTDI‐T based on asymmetric thianaphthene fused perylenediimide (TDI) and thiophene unit . All‐PSCs based on PTB7‐Th: PTDI‐T achieved a PCE of 4.70%, which was higher than that of the analogues with symmetric structure and a V OC as high as 1.03 V could be obtained when using PBDB‐T as donor.…”