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Title: Propeller-shaped acceptors for high-performance non-fullerene solar cells: Importance of the rigidity of molecular geometry

Journal Article · · Chemistry of Materials

This study describes the synthesis and application of βTPB6 and βTPB6-C as electron acceptors for organic solar cells. Compound βTPB6 contains four covalently bonded PDIs with a BDT-Th core at the β-position. The free rotation of PDIs renders βTPB6 with varying molecular geometries. The cyclization of βTPB6 yields βTPB6-C with high rigidity of the molecular geometry and enlarged conjugated skeleton. The inverted solar cells based on βTPB6-C and PTB7-Th as the donor polymer exhibited the highest efficiency of 7.69% with Voc of 0.92 V, Jsc of 14.9 mAcm–2, and FF of 0.56, which is 31% higher than that for βTPB6 based devices. The larger fraction of βTPB6-C and PTB7-Th than that of βTPB6:PTB7-Th in a blend film takes a face-on orientation packing pattern for π-systems that benefits the charge transport and hence higher PCE value than that for βTPB6:PTB7-Th. It was also found that a proper DIO:DPE additive further enhances this trend, which results in an increase of the PCE value for βTPB6-C:PTB7-Th while decreasing the PCE value for βTPB6:PTB7-Th.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; National Science Foundation (NSF); University of Chicago, Materials Research Science & Engineering Center (MRSEC)
Grant/Contract Number:
AC02-06CH11357; SC0001059
OSTI ID:
1352567
Journal Information:
Chemistry of Materials, Vol. 29, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 77 works
Citation information provided by
Web of Science

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Perylene derivatives for solar cells and energy harvesting: a review of materials, challenges and advances journal August 2019
Multifunctional Diketopyrrolopyrrole-Based Conjugated Polymers with Perylene Bisimide Side Chains journal November 2017
A versatile star-shaped organic semiconductor based on benzodithiophene and diketopyrrolopyrrole journal January 2019
Enhancement of intra- and inter-molecular π-conjugated effects for a non-fullerene acceptor to achieve high-efficiency organic solar cells with an extended photoresponse range and optimized morphology journal January 2018
Benzodithiophene‐Fused Perylene Bisimides as Electron Acceptors for Non‐Fullerene Organic Solar Cells with High Open‐Circuit Voltage journal May 2019
Carboxylate substitution position influencing polymer properties and enabling non-fullerene organic solar cells with high open circuit voltage and low voltage loss journal January 2018
Star‐Shaped Non‐Fullerene Small Acceptors for Organic Solar Cells journal September 2019
Ring fusion attenuates the device performance: star-shaped long helical perylene diimide based non-fullerene acceptors journal January 2019
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