Enhanced efficiency and stability of PTB7-Th-based multi-non-fullerene solar cells enabled by the working mechanism of the coexisting alloy-like structure and energy transfer model

Sora Oh, Chang Eun Song, Taeho Lee, Ara Cho, Hang Ken Lee, Jong Cheol Lee, Sang Jin Moon, Eunhee Lim, Sang Kyu Lee, Won Suk Shin

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

A simple-structured nonfullerene acceptor (NFA), T2-ORH, consisting of a bithiophene core and octyl-substituted rhodanine ends is utilized as the third component in ternary-blend solar cells with PTB7-Th and EH-IDTBr as host materials. T2-ORH is a wide band gap NFA and specially contributes to light absorption, which provides complimentary absorption with a low band gap acceptor, EH-IDTBR. In the ternary device, a PCE of 11.55%, a short circuit current (JSC) of 17.51 mA cm-2, a fill factor (FF) of 63% and an open circuit voltage (VOC) of 1.05 V were achieved with a 1:1:1 blend ratio. In this ternary system, it is estimated that the two NFAs work as one alloy-like acceptor and energy transfer model from T2-ORH to EH-IDTBR for efficient ternary-blend organic solar cells (OSCs). On conducting thermal, light, and air-process stability tests, the ternary-blend systems show superior stability performance owing to the formation of a stable and robust morphology. Finally, we fabricated a large-scale device (5 cm × 5 cm substrate, 13.5 cm2 aperture size, and a geometric FF of 54%) with the same ternary system. The sub-module ternary-blend OSCs displayed the highest PCE of 10.08% with JSC = 2.83 mA cm-2, VOC = 6.36 V and FF = 56%. As a result, ternary-blend OSCs show tremendous promise for use in actual applications.

Original languageEnglish
Pages (from-to)22044-22053
Number of pages10
JournalJournal of Materials Chemistry A
Volume7
Issue number38
DOIs
StatePublished - 2019

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