Conjugated Polymers based on cyclopenta[c]thiophene-4,6(5H)-dione with different alkyl groups for photovoltaic application

Donghwan Son^a^,^b, Rahmatia F. B. Nasrun^a^,^b, Qurrotun A. K. Nisa^a^,^b, Kain Kang^a^,^b, Indah S. Sausan^a^,^b, Joo Hyun Kim^a^,^b

^aDepartment of Polymer Engineering, Pukyong National University, Busan 48513, South Korea

^bCECS Research Institute, Core Research Institute, Busan 48513, South Korea

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2024 Conference (MATSUS24)

#MAPUP-OPV - Materials and Processes for the Scale-up of Organic Photovoltaics

Barcelona, Spain, 2024 March 4th - 8th

Organizers: Ignasi Burgués, Andreas Distler and Sergi Riera-Galindo

Poster, Joo Hyun Kim, 061
Publication date: 18th December 2023

A series of polymers are designed and synthesized as the donors for polymer solar cells (PSCs). The polymers were developed based on thiophene-indandione derivatives named DEHOB-BDTF and DBOOB-BDTF. The polymers have a combination of electron donor (D) and electron acceptor (A), in which 5-(3,4-bis(((2-ethylhexyl)oxy)benzylidene)-1,3-dibromo-4H-cyclopenta[c]thiophene-4,6(5H)-dione (DEHOB) or 5-(3,4-bis((2-butyloctyl)oxy)benzylidene)-1,3-dibromo-4H-cyclopenta[c]thiophene-4,6(5H)-dione (DBOOB) serves as the electron acceptor units. Non-fullerene inverted-type PSCs are fabricated with an ITO/ZnO/polymer:Y6BO/MoO₃/Ag structure in which Y6BO (2-((Z)-2-((10-((Z)-((E)-1-(cyano(isocyano)methylene)-5,6-difluoro-3-oxo-1H-inden-2(3H)-ylidene)methyl)-12,13-bis(2-butyloctyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo [3,4-e]thieno [2″,3″:4′,5′]thieno [2′,3′:4,5]pyrrolo [3,2-g]thieno [2′,3′:4,5]thieno [3,2-b]indol-2-yl)methylene)-5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile) is used as a non-fullerene type electron acceptor. The power conversion efficiency (PCE) of the device based on DEHOB-BDTF reached up to 8.49% (an open-circuit voltage of 0.85 V and a short-circuit current density of 20.1 mA/cm²). Furthermore, the longer alkoxy chain enhances solubility making a well-ordering in DBOOB and reaching the fill factor of 54.2%. This is due to the extended alkoxy chain, which can improve the miscibility in the blend.

Acknowledgements:

This research was supported by the National Research Foundation (NRF) of Korea under program number (2022R1A2C1003891) and was supported by the core research institute (CRI) program, the basic science research program through the national research foundation of Korea (NRF) under program number (2022R1A6A1A03051158).

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