Room-temperature Processed Transparent Conductive Oxides For Efficient And Semi-transparent Perovskite And Organic Solar Cells
Zhengfei Wei a, Benjamin Smith a, Amirah Way a, Vasil Stoichkov a, Francesca De Rossi a, Harrison Ka Hin Lee a, Jérémy Barbé a, Wing C. Tsoi a, Justin Searle a, David Worsley a, Trystan Watson a
a SPECIFIC, College of Engineering Swansea University, SPECIFIC, Baglan Bay Innovation Centre, Central Avenue, Baglan, Port Talbot, SA12 7AX, United Kingdom
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Oral, Zhengfei Wei, presentation 024
Publication date: 14th October 2019

In order to achieve semi-transparency in perovskite and organic solar cells, the electrode materials must be as transparent as possible. In this work, MoOx/ITO/Ag/ITO (MoOx/IAI) and MoOx/IZO thin films with respective high-average-transmittance of 79.90% and 85% between 400 nm and 900 nm were introduced as the top transparent electrode to explore its influences on optoelectronic properties of the fabricated perovskite and organic solar cells. MoOx has been demonstrated previously as protection from sputtering damage using a conventional ITO or IZO top electrode, however it is shown here to provide protection from a sputtered IAI and IZO film that provides superior transparency and conductivity and is deposited using more favourable low temperature processing conditions. MoOx and Ag were thermally evaporated and ITO and IZO was radio-frequency magnetron sputtered at room temperature. The resulting semi-transparent solar cells showed power conversion efficiency of 12.85% for IAI based PSCs, 16.03% for IZO based PSCs and 4.58% for IZO based OPV, respectively.  The semi-transparent perovskite devices showed a much-reduced degradation rate as compared to the reference device with only an Ag/Au top electrode. Notably, we show that an unencapsulated semi-transparent perovskite cell using MoOx/IZO maintains its full performance under continuous illumination for over 770 hours in nitrogen environment. With such a combination of performance and transparency, this work shows great promise in application of perovskite solar cells into window glazing products for building integrated photovoltaic applications (BIPV), powering internet of things (IoT) and combining into tandem solar cells with industrially mature photovoltaic technologies such as silicon and copper indium gallium di-selenide (CIGS).

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