Structure-properties relationships in triarylamine-based donor materials for organic photovoltaics

Clément Cabanetos^a, Jean Roncali^a, Yue Jiang^a^,^b

^aMoltech-Anjou, 1 Square Flora Triatan, Romm 579, Angers, 49000, France

^bSouth China University of Technology, Avda Sos baynat, Castellón, 12070

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Yue Jiang, 319
Publication date: 5th February 2015

Organic solar cells (OSCs) are a focus of considerable current interest motivated by the possibility to propose a low cost and environmentally friendly alternative to silicon solar cells. An OSC basically involves the heterojunction created by contacting and electron donor material with an acceptor. Although, conjugated polymers have remained for years the most efficient materials, work aiming at the replacement of polymers by molecular donors¹ has progressed rapidly and very recently record efficiencies similar to those obtained with polymers (~ 10 %) have been reported for optimized solar cells based on molecular donors of rather complex chemical structure.² With the aim of developing molecular donors combining structural simplicity, straightforward clean and scalable synthesis^3-5 our group has intensively investigated various series of push-pull structures in which triarylamine blocks are connected to an acceptor group through a p-conjugated bridge.^4-6 In this presentation we report on of a new series of small molecular donors in which one of the phenyl ring of the triphenylamine (TPA) block of the basic structure 1a⁴ has been replaced by various aromatic or aliphatic units (1b-h).⁵ The characterization of the structure and electronic properties of the molecules by X-ray diffraction, UV-Vis absorption spectroscopy and cyclic voltammetry will be presented and the effects of the modification of the TPA donor block on the hole-mobility of the donor material and on the performances of planar heterojunction solar cells fabricated with vacuum-deposited fullerene C₆₀ as acceptor will be discussed in terms of structure-properties relationships.
Structure of target compounds
1. Jean, R.; Molecular Bulk Heterojunctions: An Emerging Approach to Organic Solar Cells Acc. Chem. Res. 2009, 42, 1719-1730. 2. Bin K.; Qian Z.; Miaomiao L.; Xiangjian W.; Wang N.; Guankui L.; Yunchuang W.; Xuan Y.; Huanran F.; Yongsheng C. Solution-Processed Organic Solar Cells Based on DialkylthiolSubstituted Benzodithiophene Unit with Efficiency near 10%. J. Am. Chem. Soc. 2014, 136, 15529-15532. 3. Jean R.; Philippe L.; Phillipe B. Molecular Materials for Organic Photovoltaics: Small is Beautiful. Adv. Mater. 2014, 26, 3821-3838. 4. Antoine L.; Jérémie G.; Magali A.; Philippe B.; Dora D.; Thodulf R.; Jean R. Small D–π–A Systems with o-Phenylene-Bridged Accepting Units as Active Materials for Organic PhotovoltaicsChem Eur. J. 2013, 19, 9948-9960. 5. Andreea D.; Dora D. ; Magali A. ; Ion G. ; Jean R. Simple and Versatile Molecular Donors for Organic Photovoltaics Prepared by Metal-Free Synthesis. Chem. Eur. J. 2015, 21, 1598-1608. 6. Yue J.; Clément C. ; Magali A.; Ping L. ; Jean R. (submitted)

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