An obvious improvement in the performance of ternary organic solar cells with "guest" donor present at the "host" donor/acceptor interface

Peng Qing Bi, Bo Wu, Fei Zheng, Wei Long Xu, Xiao Yu Yang, Lin Feng, Fu Rong ZHU, Xiao Tao Hao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

A small-molecule material, 7,7-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo-[c] [1,2,5]thiadiazole) (p-DTS(FBTTH2)2), was used to modify the morphology and electron-transport properties of the polymer blend of poly(3-hexythiophene) (P3HT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) bulk heterojunctions. As a result, a 24% increase in the power-conversion efficiency (PCE) of the p-DTS(FBTTH2)2:P3HT:PC71BM ternary organic solar cells (OSCs) is obtained. The improvement in the performance of OSCs is attributed to the constructive energy cascade path in the ternary system that benefits an efficient Förster resonance energy/charge transfer process between P3HT and p-DTS(FBTTH2)2, thereby improving photocurrent generation. It is shown that p-DTS(FBTTH2)2 molecules engage themselves at the P3HT/PC71BM interface. A combination of absorption enhancement, efficient energy transfer process, and ordered nanomorphology in the ternary system favors exciton dissociation and charge transportation in the polymer bulk heterojunction. The finding of this work reveals that distribution of the appropriate "guest" donor at the "host" donor/acceptor interface is an effective approach for attaining high-performance OSCs.

Original languageEnglish
Pages (from-to)23212-23221
Number of pages10
JournalACS applied materials & interfaces
Volume8
Issue number35
DOIs
Publication statusPublished - 7 Sep 2016

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • charge collection
  • energy/charge transfer
  • morphology control
  • synergistic effect
  • ternary organic solar cells

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