Bridging the gap: Wide-bandgap perovskite solar cells for transparent and efficient BIPVs
Jessica Barichello a, Farshad Jafarzadeh b, Gyanendra Shank b, Paolo Mariani b, Francesca Brunetti b, Aldo Di Carlo b, Fabio Matteocci b
a ISM-CNR, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy
b CHOSE, Centre for Hybrid Organic Solar Energy, Department of Electronic Engineering, University of Rome, Tor Vergata, Via del Politecnico 1, 000133, Roma, Italy
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
València, Spain, 2024 May 12th - 15th
Organizer: Bruno Ehrler
Oral, Jessica Barichello, presentation 066
Publication date: 6th February 2024

Narrow-bandgap perovskite solar cells have revolutionized photovoltaics, achieving remarkable power conversion efficiencies (PCE) up to 25%. However, their opaque and dark color has hindered their widespread adoption in building-integrated photovoltaic (BIPV) applications due to sustainability in our everyday surroundings. By manipulating the chemical composition of the perovskite materials, a new frontier of transparency in perovskite solar cells has been unlocked. By widening the bandgap of perovskite, reaching up 2.6 eV, researchers have successfully bridged the gap between transparency and efficiency. This breakthrough paves the way for a new generation of BIPVs that blend seamlessly into architectural designs while delivering substantial energy savings. By using a transparent conductive oxide as top electrode, three generation of wide-bandgap perovskite solar cells, hybrid halide perovskite (Ma+ and Fa+), inorganic halide (Cs+) and inorganic Pb-free perovskite have been studied and developed in a full-semitransparent stack with the aim to meet harmony between conversion efficiency and transparency. These devices exhibit impressive transmittances, reaching a staggering 70%. FaPbBr3 attained an impressive PCE of 8% with a remarkable VOC up to 1.7 V while also exhibiting suitability for blade coating on glass [1] and plastic substrates, paving the way for large-scale production. CsPbBr3, a fully inorganic perovskite, has been scrutinized in an attempt to bolster its α-phase, and a Pb-free Cs2AgBiBr6, holistic inorganic wide band gap perovskite solar cell has been successfully fabricated maintaining this high level of transparency reaching 8% at low light illumination. Furthermore, we are presenting for the first time a 25 cm2 module for a blade-coated, fully inorganic, lead-free perovskite-like material capable of powering electronic devices in the IoT field. This advancement eliminates concerns about the potential environmental impact of lead in perovskite structures. The development of wide-bandgap perovskite solar cells represents a significant leap forward in the field of photovoltaics. These transparent devices hold immense promise for seamlessly integrating solar energy into buildings, reducing our reliance on fossil fuels and promoting a sustainable future.

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