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HL: Fachverband Halbleiterphysik

HL 57: Organic Photovoltaics and Electronics II (joined session with CPP)

HL 57.4: Vortrag

Mittwoch, 22. März 2017, 15:30–15:45, POT 81

Silver nanowires and polymer based transparent electrodes for Organic solar cells — •Yoonseok Park, Ludwig Bormann, Koen Vandewal, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, Germany

Organic photovoltaics (OPV) are prospective candidates for future renewable energy production because of their potential scalability, low cost, and flexibility. For establishing flexible organic devices, a highly transparent, conductive and flexible electrode is required, replacing ITO which is brittle and requires high temperature processes. Many alternative materials such as conductive polymers, graphene, and metal nanowires have been studied. Among these, metal nanowires, especially silver nanowire (AgNW) networks, show outstanding flexibility, conductivity, and transparency. However, AgNW network electrodes have a few basic problems: (i) a poor electrical contact between wires, resulting in a low conductivity, (ii) overlapping wires cause roughness, often resulting in electrical shorting of devices and (iii) open spaces between wires can be in the range of square micrometers. In this study, highly conductive PEDOT:PSS has been deposited on AgNW electrodes to form conductive bridges between the open spaces and to smoothen the sharp points of the network. The maximum process temperature is 120 °C. OPV cells using these AgNW / PEDOT:PSS transparent electrodes exhibit power conversion efficiencies up to 7.15%. Moreover, OPV devices on PET substrates with an alumina encapsulation and barrier adhesive show excellent mechanical flexibility.