Non-halogenated solvents for fully spray-coated organic photovoltaic modules: fabrication by using an automated in-air process and preliminary results on stability

Luca La Notte^a^,^b, Thomas M. Brown^a^,^b, Gianpaolo Susanna^a^,^b, Francesca Brunetti^a^,^b, Giuseppina Polino^a^,^b, Aldo Di Carlo^a^,^b, Luigi Salamandra^a^,^b, Andrea Reale^a^,^b

^aDep. El. Engineering. Univ. Rome Tor Vergata, Via Politecnico, 1, Rome, 00133, Italy

^bCHOSE - Centre for Hybrid and Organic Solar Energy, University of Rome ‘‘Tor Vergata’’, Via del Politecnico, 1, Roma, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Andrea Reale, 177
Publication date: 1st March 2014

Low cost processing is a fundamental aspect for effective success of Organic Photovoltaics. Several large area-compatible and solution-based processes have been reported as the key factors for achieving the required high throughput for low cost [1]. Among these, spray coating is a well-established technique in the industry which can be successfully applied to bulk heterojunction polymer solar cells. It allows to deposit fluids with different rheologies on arbitrary substrate materials and geometries in a simple and low cost way, minimizing the material waste [2,3].

We report on the fabrication of fully spray-coated ITO/ETL/P3HT:PCBM/PEDOT-CPP/PH1000 modules on glass and PET substrates covered with transparent conducting oxide, by means of an automated process completely performed in air and by using non-halogenated solvents, and different electron transport layers (ETL). These conditions lend themselves well to be applied in a real large scale processing and reduce the environmental impact [4]. Good reproducibility and encouraging electrical performances were obtained.

The shelf life of the devices has been improved up to 1000h as a result of a suitable encapsulation and a specific study of the influence of the ETL on the stability of test devices. Preliminary outdoor tests have been performed to investigate the module behavior as a function of irradiation, angle of incidence and temperature.

Full spray polymeric OPV module
[1] R. Sondergard, M. Hosel, D. Angmo, T. T. Larsen-Olsen, F. C. Krebs, Materials Today, 12, 1-2 (2012) 36-49. [2] A. Abdellah, B. Fabel, P. Lugli, G. Scarpa, Organic electronics 11 (2010) 1031-1038. [3] L. La Notte, D. Mineo, G. Polino, G. Susanna, F. Brunetti, T. M. Brown, A. Di Carlo, A. Reale, Energy Technology, 1, 12 (2013) 709. [4] Chu-Chen Chueh, Kai Yao, Hin-Lap Yip, Chih-Yu Chang, Yun-Xiang Xu, Kung-Shih Chen, Chang-Zhi Li, Peng Liu, Fei Huang, Yiwang Chen, Wen-Chang Chen and Alex K.-Y. Jen., Energy Environ. Sci., 6 (2013) 3241-3248.

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