Flexible Perovskite solar cells employing in-house engineered hole transport material irradiated under atmospheric neutrons
giulio koch a, Daniel Augusto Machado de Alencar b, Cullen Chosy c d, Samyuktha Noola b, Farshad Jafarzadeh a, Kyle Frohna c d, Matteo Bonomo b, Pierluigi Quagliotto b, Paolo Rech e, Carlo Cazzaniga f, Marco Ottavi g h, Francesca De Rossi a, Samuel Stranks c d, Claudia Barolo b, Francesca Brunetti a
a CHOSE, Dep. of Electronic Engineering, University of Rome Tor Vergata 00133, Italy
b Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, Università Degli Studì di Torino, Via Pietro Giuria 7, 10125, Torino, Italy.
c Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, UK.
d Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.
e HiCREST, Department of Industrial Engineering, University of Trento, 38123 Povo, Italy.
f UKRI-STFC, Rutherford Appleton Laboratory, Didcot,OX11 0QX, United Kingdom.
g Dep. of Electronic Engineering, University of Rome Tor Vergata 00133, Italy.
h CAES, University of Twente, Enschede, 7522 NB, The Netherlands.
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Sardinia, Italy, 2024 June 17th - 18th
Organizers: Giulia Grancini, Francesca Brunetti and Maria Antonietta Loi
Poster, giulio koch, 034
Publication date: 25th April 2024

Flexible perovskite solar cells (f-PSC) are excellent candidates for space applications thanks to record efficiencies of 23.4% [1], close to the 26.1% record reached by rigid devices [a], and excellent power densities as high as 30 W/g [2].

Our previous work in Hole Transport Material (HTM) optimization revealed the positive impact of the insertion of benzothiadiazole (BTD) unit on a P3HT scaffold upon neutron irradiation [3]. Here, we synthesized two different HTMs in which PTAA is copolymerized with (i) a phenothiazine or (ii) both a phenothiazine and a BTD. As an added value, the new HTMs could be processed in more sustainable solvents than toluene, i.e., THF.

Neutrons have been shown to induce degradation in the performance of traditional solar cells in space. However, the literature on PSC matters is still not as extensive. Studying potential damage sources selectively will help us estimate our devices' aging in space more accurately. Therefore, we studied degradation damages induced by atmospheric-like neutrons (fluence of 5*109 n/cm2) provided by the Chip-IR beamline in the Rutherford Appleton Laboratory, which can represent the environment in Low Earth Orbit [4]. PV characterization of the devices showed that the new HTMs are a viable alternative to the commercially available PTAA, with improved resilience to atmospheric neutrons. Furthermore, photoluminescence imaging revealed negligible damage in the active perovskite itself, suggesting that the loss in electrical performance is attributable to charge extraction processes and interface degradation.


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