Ultra-Thin Flexible Glass Perovskite Solar Cells as Outstanding Photovoltaic Light Harvesters Under Indoor Illumination
Giulia Lucarelli a, Sergio Castro-Hermosa a, Michiel Top b, Matthias Fahland b, John Falteich b, Thomas M. Brown a
a CHOSE - Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico, 1, Roma, Italy
b Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, Winterbergstrasse 28, 01277 Dresden, Germany
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Giulia Lucarelli, 160
Publication date: 11th February 2019

Flexible photovoltaics has attracted widespread attention due to the combination of excellent physical properties, including being thin, light weight, conformable to curved surfaces and compatible with roll-to-roll manufacturing [1]. The possibility of integrating this type of PV on many surfaces and products seamlessly makes them a prime candidate for application as indoor light harvesters to power electronic products such as wireless sensors, consumer electronics, internet of things applications [2]. Currently, the best power conversion efficiencies (PCE) under typical white LED indoor illumination of 200 lx and 400 lx of PV developed on poly ethylene terephthalate substrates is between 12 and 13% [3]. Here we present a breakthrough in performance for indoor PV developing flexible perovskite solar cells (PSCs) on flexible glass that for the first time surpass the 20% PCE value at 200 lx and 22% at 400 lx (20.6% PCE, corresponding to 16.7 µW cm-2 MPD, and 22.6% PCE corresponding to 35.0 µW cm-2 MPD, at 200 lx and 400 lx respectively). These values correspond to the highest reported values for any photovoltaic technology on flexible substrates tested in indoor conditions by far. Superior performances of FG-based devices are attributed to the opto-electrical properties of the substrates, such as the average transmittance of 81.22% in the visible spectra, which is ~15% higher than commercial PET/ITO used in this research, and a sheet resistance of 13  sq-1 which is ~13% lower than that of PET/ITO. Performances are even better than same architectures on rigid glass substrates as a result of higher transparencies/photocurrents. Compared to PET-based PSCs, devices on FG show low recombination currents, as evident from the analysis of the dark currents (Jon/Joff ~104), by lower series resistances and higher shunt resistances as extrapolated from the I-V curves at low light levels.  Additionally, un-encapsulated FG-PSCs show improved stability compared to their PET counterparts. These results show that flexible PSCs fabricated on FG can become prime candidates as energy harvesters in indoor environments and as power supplies for light-weight low-power devices.

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