Effect of Palladium‐Tetrakis(Triphenylphosphine) Catalyst Traces on Charge Recombination and Extraction in Non‐Fullerene‐based Organic Solar Cells

Schopp, Nora; Brus, Viktor V.; Lee, Jaewon; Dixon, Alana; Karki, Akchheta; Liu, Tuo; Peng, Zhengxing; Graham, Kenneth R.; Ade, Harald; Bazan, Guillermo C.; Nguyen, Thuc‐Quyen

doi:10.1002/adfm.202009363

Effect of Palladium‐Tetrakis(Triphenylphosphine) Catalyst Traces on Charge Recombination and Extraction in Non‐Fullerene‐based Organic Solar Cells

Journal Article · Mon Feb 08 00:00:00 EST 2021 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202009363· OSTI ID:1804186

^[1]; ^[2]; Lee, Jaewon ^[3]; Dixon, Alana ^[1]; ^[1]; Liu, Tuo ^[4]; Peng, Zhengxing ^[5]; Graham, Kenneth R. ^[4]; Ade, Harald ^[5]; Bazan, Guillermo C. ^[1]; ^[1]

Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara (UCSB) Santa Barbara CA 93106 USA
Department of Physics School of Sciences and Humanities Nazarbayev University Nur‐Sultan 010000 Republic of Kazakhstan
Department of Chemical Engineering and Applied Chemistry Chungnam National University Daejeon 34134 Republic of Korea
Department of Chemistry University of Kentucky 505 Rose St. Lexington KY 40506‐0055 USA
Department of Physics Organic and Carbon Electronics Laboratories (ORaCEL) NC State University Raleigh NC 27695‐8202 USA

Abstract

The effect of the cross‐coupling catalyst tetrakis(triphenylphosphine)palladium(0) (Pd(PPh ₃ ) ₄ ) on the performance of a model organic bulk‐heterojunction solar cell composed of a blend of poly([2,6′‐4,8‐di(5‐ethylhexylthienyl)benzo[1,2‐b;3,3‐b]dithiophene]{3‐fluoro‐2[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl}) (PTB7‐Th) donor and 3,9‐bis(2‐methylene‐((3‐(1,1‐dicyanomethylene)‐6,7‐difluoro)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene (IOTIC‐4F) non‐fullerene acceptor is investigated. The effect of intentional addition of different amounts of Pd(PPh ₃ ) ₄ on morphology, free charge carrier generation, non‐geminate bulk trap‐ and surface trap‐assisted recombination as well as bimolecular recombination and charge extraction is quantified. This work shows that free charge carrier generation is affected significantly, while the impact of Pd(PPh ₃ ) ₄ on non‐geminate recombination processes is limited because the catalyst does not facilitate efficient trap‐assisted recombination. The studied system shows substantial robustness towards the addition of Pd(PPh ₃ ) ₄ in small amounts.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1804186

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 15 Vol. 31; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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