Photovoltaic Limitations of Colloidal Perovskite Nanocrystal Photovoltaics
Galatopoulos F. a, Papagiorgis P. b, Chrusou A.Z. a, Bernasconi C. c, Bodnarchuk M.I. d, Kovalenko M.V. c d, Itskos G. b, Choulis S.A: a
a Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Archiepiskopou Kyprianou, 30, Limassol, Cyprus
b Department of Physics, Experimental Condensed Matter Physics Laboratory, University of Cyprus, Kallipoleos, 75, Nicosia, Cyprus
c Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Hönggerberg, 8093 Zúrich, Suiza, Zúrich, Switzerland
d Laboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
#OPTONEXT - Next Gen Semiconductors for Optoelectronics
Barcelona, Spain, 2022 October 24th - 28th
Organizers: Paul Shaw and Mike Hambsch
Poster, Galatopoulos F., 336
Publication date: 11th July 2022

Perovskite nanocrystals (PNCs) have attracted tremendous attraction over the years both in LED and solar cell performance 1. Several inherent material properties are desirable for both applications such as high photoluminescence quantum yield (PLQY) and as well as the minimization of radiative recombination processes.2 Furthermore, PNCs show relatively high defect tolerance and tenability of the band gap due to the easy control of the size of the nanoparticles (NPs).3 In this work we compare photovoltaic (PV) devices based on (CH2(NH2))2PbI3 (FAPBI3) and CsPbI3. Specifically we compared the photovoltaic (PV) performance of FAPBI3 and CsPbI3 FAPbI3 in various conditions such as in ambient and inert atmospheres as well as introducing several ligand washing (LW) steps. FaPbI3 shows increase in grain size upon the introduction of a ligand washing (LW) step with formamidinium iodide (FAI) in EtAc due to the agglomeration of the nanoparticles (NPs). Devices based on FAPBI3 have achieved a maximum PCE=1.93% with the introduction of 3 LW steps with formamidinium iodide (FA) dissolved in ethyl acetate (EtAc) while CsPbI3 have achieved PCE=1.83 % using the same LW steps. The main limiting factor in both cases is the low Jsc and FF due to the high series resistance (Rs) which is tied to improper oleic acid ligand washing. Oleic acid is known to have low conductivity and therefore proper LW is essential to ensure proper PV performance. Interestingly, solar cells based on FAPBI3 show significantly lower PCE if they are fabricated in ambient conditions compared to inert conditions, while devices based on CsPbI3 show similar PCE in both cases. It is important to note that although solar cells based on CsPbI3 show similar PCEs both in inert and ambient conditions, the solar cells that were fabricated in ambient conditions are less reproducible compare to the ones fabricated in inert atmosphere.

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