Molecular photovoltaic devices: The Central Role of Chemistry.
Emilio Palomares b
a ICIQ – Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
b ICREA, Passeig Lluís Companys 23, 08010, Barcelona, Spain
Invited Speaker Session, Emilio Palomares, presentation 079
Publication date: 6th February 2024

During my lecture, I will present our latest results on characterizing different types of Self-Assembled Molecules (SAMS) for perovskite solar cells using advanced photo-induced time-resolved techniques. Using PICE (Photo-induced charge extraction), PIT-PV (Photo-induced Transient PhotoVoltage), and other techniques, we have been able to distinguish between capacitive electronic charge and a more significant amount of charge because of the intrinsic properties of the perovskite material and it's dependence on the different selective contacts based on SAMs. Moreover, the results allow us to compare different materials used as hole transport materials (HTM) and the relationship between their HOMO and LUMO energy levels, the solar cell efficiency, and the charge losses because of interfacial charge recombination processes occurring at the device under illumination. These techniques and measurements are crucial to understanding the device's function and further improving the efficiency and stability of perovskite MAPI-based solar cells. The need for novel materials that make more stable devices without compromising efficiency is critical for commercializing these types of solar cells. We will show some examples of those future materials that will soon be present on the market.

The authors acknowledge financial support from the Spanish Government and AGAUR (Ministerio de Ciencia e Innovation Severo Ochoa Grant MCIN/AEI/10.13039/501100011033 (CEX2019-000925-S), PID2019-109389RB-I00 and 2021 SGR 01261, respectively). C.P. thanks for the MSCA-COFUND I2: ICIQ Impulsion (ICIQ-CAT-2002) support. D.A.G. acknowledges financial support from the MINECO pre-doctoral fellowship (BES-2017-082439). E.P. also acknowledges ICIQ, CERCA, and ICREA for financial support.

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