Hole-Transfer Dependence on Blend Morphology and Energy Level Alignment in Polymer ITIC Photovoltaic Materials

Hole-Transfer Dependence on Blend Morphology and Energy Level Alignment in Polymer : ITIC Photovoltaic Materials

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 30(2018), 3 vom: 26. Jan.
1. Verfasser: Eastham, Nicholas D (VerfasserIn)
Weitere Verfasser: Logsdon, Jenna L, Manley, Eric F, Aldrich, Thomas J, Leonardi, Matthew J, Wang, Gang, Powers-Riggs, Natalia E, Young, Ryan M, Chen, Lin X, Wasielewski, Michael R, Melkonyan, Ferdinand S, Chang, Robert P H, Marks, Tobin J
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article fill factors hole-transfer morphology nonfullerene photovoltaics organic photovoltaics
Beschreibung
Zusammenfassung:© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Bulk-heterojunction organic photovoltaic materials containing nonfullerene acceptors (NFAs) have seen remarkable advances in the past year, finally surpassing fullerenes in performance. Indeed, acceptors based on indacenodithiophene (IDT) have become synonymous with high power conversion efficiencies (PCEs). Nevertheless, NFAs have yet to achieve fill factors (FFs) comparable to those of the highest-performing fullerene-based materials. To address this seeming anomaly, this study examines a high efficiency IDT-based acceptor, ITIC, paired with three donor polymers known to achieve high FFs with fullerenes, PTPD3T, PBTI3T, and PBTSA3T. Excellent PCEs up to 8.43% are achieved from PTPD3T:ITIC blends, reflecting good charge transport, optimal morphology, and efficient ITIC to PTPD3T hole-transfer, as observed by femtosecond transient absorption spectroscopy. Hole-transfer is observed from ITIC to PBTI3T and PBTSA3T, but less efficiently, reflecting measurably inferior morphology and nonoptimal energy level alignment, resulting in PCEs of 5.34% and 4.65%, respectively. This work demonstrates the importance of proper morphology and kinetics of ITIC → donor polymer hole-transfer in boosting the performance of polymer:ITIC photovoltaic bulk heterojunction blends
Beschreibung:Date Completed 01.08.2018
Date Revised 01.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201704263