Mechanistic Investigation into Dynamic Function of Third-Component Incorporated in Ternary Near-Infrared Nonfullerene Organic Solar Cells
(2020) In Advanced Functional Materials 30(31).- Abstract
Organic solar cells (OSCs) consisting of an ultralow-bandgap nonfullerene acceptor (NFA) with an optical absorption edge that extends to the near-infrared (NIR) region are of vital interest to semitransparent and tandem devices. However, huge energy-loss related to inefficient charge dissociation hinders their further development. The critical issues of charge separation as exemplified in NIR-NFA OSCs based on the paradigm blend of PTB7–Th donor (D) and IEICO–4F acceptor (A) are revealed here. These studies corroborate efficient charge transfer between D and A, accompanied by geminate recombination of photo-excited charge carriers. Two key factors restricting charge separation are unveiled as the connection discontinuity of individual... (More)
Organic solar cells (OSCs) consisting of an ultralow-bandgap nonfullerene acceptor (NFA) with an optical absorption edge that extends to the near-infrared (NIR) region are of vital interest to semitransparent and tandem devices. However, huge energy-loss related to inefficient charge dissociation hinders their further development. The critical issues of charge separation as exemplified in NIR-NFA OSCs based on the paradigm blend of PTB7–Th donor (D) and IEICO–4F acceptor (A) are revealed here. These studies corroborate efficient charge transfer between D and A, accompanied by geminate recombination of photo-excited charge carriers. Two key factors restricting charge separation are unveiled as the connection discontinuity of individual phases in the blend and long-lived interfacial charge-transfer states (CTS). By incorporation of a third-component of benchmark ITIC or PC71BM with various molar ratios, these two issues are well-resolved accordingly, yet in distinctly influencing mechanisms. ITIC molecules modulate film morphology to create more continuous paths for charge transportation, whereas PC71BM diminishes CTS and enhances electron transfer at the D/A interfaces. Consequently, the optimal untreated ternary OSCs comprising 0.3 wt% ITIC and 0.1 wt% PC71BM in the blend deliver higher JSC values of 21.9 and 25.4 mA cm-2, and hence increased PCE of 10.2% and 10.6%, respectively.
(Less)
- author
- Wang, Zhuoyan ; Ji, Jingjing ; Lin, Weihua LU ; Yao, Yao ; Zheng, Kaibo LU and Liang, Ziqi
- organization
- publishing date
- 2020-08-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- charge and energy transfer, charge recombination, near-infrared, nonfullerene acceptors, organic solar cells
- in
- Advanced Functional Materials
- volume
- 30
- issue
- 31
- article number
- 2001564
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85086176523
- ISSN
- 1616-301X
- DOI
- 10.1002/adfm.202001564
- language
- English
- LU publication?
- yes
- id
- 61a2bdee-e56a-40ab-bb87-48be95554728
- date added to LUP
- 2020-07-02 16:33:51
- date last changed
- 2023-11-20 07:20:34
@article{61a2bdee-e56a-40ab-bb87-48be95554728, abstract = {{<p>Organic solar cells (OSCs) consisting of an ultralow-bandgap nonfullerene acceptor (NFA) with an optical absorption edge that extends to the near-infrared (NIR) region are of vital interest to semitransparent and tandem devices. However, huge energy-loss related to inefficient charge dissociation hinders their further development. The critical issues of charge separation as exemplified in NIR-NFA OSCs based on the paradigm blend of PTB7–Th donor (D) and IEICO–4F acceptor (A) are revealed here. These studies corroborate efficient charge transfer between D and A, accompanied by geminate recombination of photo-excited charge carriers. Two key factors restricting charge separation are unveiled as the connection discontinuity of individual phases in the blend and long-lived interfacial charge-transfer states (CTS). By incorporation of a third-component of benchmark ITIC or PC<sub>71</sub>BM with various molar ratios, these two issues are well-resolved accordingly, yet in distinctly influencing mechanisms. ITIC molecules modulate film morphology to create more continuous paths for charge transportation, whereas PC<sub>71</sub>BM diminishes CTS and enhances electron transfer at the D/A interfaces. Consequently, the optimal untreated ternary OSCs comprising 0.3 wt% ITIC and 0.1 wt% PC<sub>71</sub>BM in the blend deliver higher J<sub>SC</sub> values of 21.9 and 25.4 mA cm<sup>-2</sup>, and hence increased PCE of 10.2% and 10.6%, respectively.</p>}}, author = {{Wang, Zhuoyan and Ji, Jingjing and Lin, Weihua and Yao, Yao and Zheng, Kaibo and Liang, Ziqi}}, issn = {{1616-301X}}, keywords = {{charge and energy transfer; charge recombination; near-infrared; nonfullerene acceptors; organic solar cells}}, language = {{eng}}, month = {{08}}, number = {{31}}, publisher = {{Wiley-Blackwell}}, series = {{Advanced Functional Materials}}, title = {{Mechanistic Investigation into Dynamic Function of Third-Component Incorporated in Ternary Near-Infrared Nonfullerene Organic Solar Cells}}, url = {{http://dx.doi.org/10.1002/adfm.202001564}}, doi = {{10.1002/adfm.202001564}}, volume = {{30}}, year = {{2020}}, }