Charge transport control via polymer polymorph modulation in ternary organic photovoltaic composites

Zhipeng Kan; Letizia Colella; Eleonora V. Canesi; Alexei Vorobiev; Vasyl Skrypnychuk; Giancarlo Terraneo; David R. Barbero; Chiara Bertarelli; Roderick C. I. MacKenzie; Panagiotis E. Keivanidis

doi:10.1039/C5TA08120C

Charge transport control via polymer polymorph modulation in ternary organic photovoltaic composites†

Zhipeng Kan,^a Letizia Colella,^bc Eleonora V. Canesi,^ab Alexei Vorobiev,^d Vasyl Skrypnychuk,^e Giancarlo Terraneo,^ab David R. Barbero,^e Chiara Bertarelli,^ab Roderick C. I. MacKenzie^f and Panagiotis E. Keivanidis*^g

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* Corresponding authors

^a Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, Via Giovanni Pascoli, 70/3, 20133 Milano, Italy

^b Dipartimento di Chimica, Materiali e Ing. Chimica “G. Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

^c INAF–Osservatorio Astronomico di Brera, via Bianchi 46, Merate, Italy

^d Department of Physics & Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden

^e Nano-Engineered Materials and Organic Electronics Lab., Umeå University, Umea, Sweden

^f Faculty of Engineering, University of Nottingham, University Park, Nottingham, UK

^g Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 45 Kitiou Kyprianou str., 3041 Limassol, Cyprus
E-mail: p.keivanidis@cut.ac.cy

Abstract

The control on the charge transport properties of ternary organic photovoltaic P3HT : PCBM : QBT devices is enabled by modulating the distribution of P3HT polymorphs in the device photoactive layers. Negligible amounts of QBT induce striking modifications in the P3HT lamellar stacking direction, forming both densely packed and non-densely packed P3HT chains. The former reduce the charge carrier recombination rate, enabling an increased fill factor and short-circuit device photocurrent.

Journal of Materials Chemistry A

Charge transport control via polymer polymorph modulation in ternary organic photovoltaic composites†

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Charge transport control via polymer polymorph modulation in ternary organic photovoltaic composites

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