Improved Performance of Thick Films Based Binary and Ternary Bulk Heterojunction Organic Photovoltaic Devices Incorporated with Electrospinning Processed Nanofibers

He Jun ning Huang, Hui Rong Nan, Ying Guo Yang, Xing Yu Gao, Fei Chen, Zhi Kuan Chen

Research output: Journal PublicationArticlepeer-review

2 Citations (Scopus)

Abstract

Nanofibers (average diameter of ≈150–160 nm) consisting of both binary and ternary bulk heterojunction organic photovoltaic (BHJ-OPV) donor-acceptor pairs poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) and (P3HT/PTB7:PC61BM) are produced in a coaxial electrospinning process. Thick (≈260 nm) BHJ-OPV devices are fabricated by incorporating the nanofibers. Compared to thin (140 nm) P3HT:PC61BM binary devices, thick devices with P3HT:PC61BM nanofibers achieve an improved performance, i.e., an improvement from 65.15 to 73.24% in filling factor (FF), from 3.32 to 4.71% in power conversion efficiency (PCE), and from 8.51 to 11.09 mA cm−2 in short-circuit current density (Jsc); while compared to thin P3HT/PTB7:PC61BM ternary devices, thick devices with P3HT/PTB7:PC61BM nanofibers show an improvement from 5.1 to 5.68% in PCE, from 12.51 to 14.74 mA cm−2 in Jsc, and a decrease from 66.83 to 63.55% in FF. The improved performance is attributed to an enhanced optical absorption induced by prolonged light absorption path due to scattering from nanofibers, a favorable nanomorphology with optimum crystallinity of P3HT/PTB7 and their good mixing with PC61BM, as well as an increased in-plane alignment of P3HT and PTB7 polymer chains for efficient exciton dissociation and carrier extraction, and improved charge transport in the vertical direction.

Original languageEnglish
Article number1800914
JournalAdvanced Materials Interfaces
Volume5
Issue number20
DOIs
Publication statusPublished - 23 Oct 2018
Externally publishedYes

Keywords

  • electrospinning
  • nanofibers
  • organic photovoltaic
  • thick films

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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