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Author:

Wei, Yi (Wei, Yi.) | Liang, Ningning (Liang, Ningning.) | Jiang, Wei (Jiang, Wei.) | Zhai, Tianrui (Zhai, Tianrui.) | Wang, Zhaohui (Wang, Zhaohui.)

Indexed by:

EI Scopus SCIE

Abstract:

Molecular carbon imides, especially extended perylene diimides (PDIs) have been the best wide-band-gap nonfullerene acceptors. Despite their excellent photothermal/chemical stability, flexible reaction sites, and unique photoelectronic properties, there is still a lack of fundamental understanding of their molecular characteristics as a third component. Here, generations of PDIs with distinctive molecular architecture, are deliberately screened out as the third component to PM6:Y6. Only a rylene-fullerene hybrid, S-Fuller-PMI, surprisingly boosts the fill factor (FF) of ternary organic solar cells (OSCs) to 0.77 from 0.72 for PM6:Y6 binary ones, and therefore the power conversion efficiency (PCE) of ternary cells is enhanced from 15.3% to 16.2%. Compared with highly-flexible rylene dimer and rigid multimer, S-Fuller-PMI exhibits higher electron mobility, favorable surface tension, and, therefore tailored compatibility with Y6. These formed Y6:S-Fuller-PMI alloys play as a morphological controller to improve charge separation and transport process. Simultaneously, the suppressed photothermal-induced traps, along with inherent enlarged entropy effect, endow the ternary OSCs still with approximate to 70% of initial PCE even after 500 h continuous illumination, whereas only 53% is left in their binary counterparts. These results provide new insight into the molecular design principle for distinctive molecular carbon imides as the third component for efficient and durable PM6:Y6-based OSCs.

Keyword:

rylene-fullerene hybrids surface tension regulation ternary organic solar cells photothermal stability

Author Community:

  • [ 1 ] [Wei, Yi]Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China
  • [ 2 ] [Jiang, Wei]Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China
  • [ 3 ] [Wang, Zhaohui]Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China
  • [ 4 ] [Liang, Ningning]Beijing Univ Technol, Fac Sci, Inst Informat Photon Technol, Beijing 100124, Peoples R China
  • [ 5 ] [Zhai, Tianrui]Beijing Univ Technol, Fac Sci, Inst Informat Photon Technol, Beijing 100124, Peoples R China

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Source :

SMALL

ISSN: 1613-6810

Year: 2021

Issue: 4

Volume: 18

1 3 . 3 0 0

JCR@2022

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:116

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 14

SCOPUS Cited Count: 13

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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