Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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