Use of the PEAI with DIO as a passivation layer in CsFAMA-based perovskite solar cells
Francineide Lopes de Araújo a c, Jilian Nei de Freitas b, Sara Pescetelli c, Antonio Agresti c, Ana Flávia Nogueira a, Aldo Di Carlo c d
a Laboratory of Nanotechnology and Solar Energy, Institute of Chemistry, University of Campinas – UNICAMP, P.O. Box 6154, Campinas, 13083-970, Brazil
b Centro de Tecnologia da Informação Renato Archer - CTI - Campinas-SP, Brazil
c CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome “Tor Vergata”, 00133 Rome, Italy
d CNR-ISM – Institute for Structure of the Matter, National Research Council, Rome, 00133, Italy.
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Francineide Lopes de Araújo, 273
Publication date: 30th March 2023

Hybrid organic-inorganic perovskites have attracted great interest in photovoltaic technology due to their excellent optoelectronic properties, low-temperature processability and rapid efficiency increase from 3.9% (in 2009) to 25.8% (in 2022) [1]. However, despite these advantages, some challenges still need to be solved to speed up the commercialization of these devices. The main challenges include performance loss and low stability under environmental conditions (humidity, temperature and light), hysteresis, and upscaling. One of the main factors of losses in the photovoltaic parameters of a PSC is charge recombination in the interfaces. The application of 2D-perovskite in the perovskite/transport layer interfaces in perovskite solar cells (PSCs) has shown promising results to overcome this issue. In fact, 2D-perovskite structures passivate the surface defects and grain boundaries of the 3D perovskites, suppressing nonradiative charge recombination[2],[3],[4]. Here, we demonstrate that the use of a mixture of PEAI (phenethylammonium iodide) and 1,8-diiodooctane (DIO) as a passivating layer deposited on top of the CsFAMA perovskite film increased the efficiency (16.9% to 18.9%, forward scan), mainly the Voc (1.09 V to 1.2V, forward scan), as well as and stability of n-i-p type PSCs (Glass/FTO/SnO2/CsFAMA/PEAI+DIO/Spiro-OMeTAD/Au). Moreover, control and PEAI+DIO modified devices retained 73% and 90% of the starting PCE values, respectively, after 650 hours exposed to environmental conditions, indicating that the PEAI+DIO layer at perovskite/Spiro-OMeTAD interface provided greater stability to PSC. Additionally, we have demonstrated that using DIO additive inside PEAI film improves the optical properties, crystallinity, and morphology of CsFAMA film by steady-state PL, UV-Vis, XRD and SEM measurements.

F.L.A, J. N.F and A. F. N. gratefully acknowledge support from the São Paulo Research Foundation, FAPESP (17/11986-5) and Shell. F.L.A. acknowledges FAPESP (22/07847-8).


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