Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Low-dimensional (2D or 1D) hybrid perovskites are receiving increased attention due to their structural flexibility and a generally enhanced stability compared to their 3D counterparts. Understanding the phase formation and degradation behavior of these materials is crucial towards their use in optoelectronic devices since different crystal phases possess different optical and electronic properties.[1-4]
In the first part of this talk, I will discuss the phase formation and degradation behavior of a series of lead iodide hybrids containing bithiophene, terthiophene and quaterthiophene derivatives. We show that two crystal phases can be formed for each of these systems, depending on the processing conditions. One of these phases corresponds to a 2D layered perovskite and the other phase has optical properties corresponding to a dimensionality intermediate between typical 2D and 1D hybrids.
In the second part of this talk, I will discuss the influence of halide substitution on the phase formation of 2D layered perovskites (Bit-C3)2PbX4 (with X= Cl, Br, and I), containing a bithiophene derivative (Bit-C3). The crystal structure and phase behavior of the 2D layered HOIPs were studied in detail. It is suggested that via halide substitution from iodide to bromide and chloride, the molecular degrees of freedom of the Bit-C3 ammonium cations are reduced by spatial confinement due to a smaller inorganic framework. Therefore, limiting the formation of lower-dimensional hybrids besides the targeted 2D layered HOIP.
The FWO is acknowledged for the funding of the research. P-H.D. is a special research fund (BOF) doctoral (Ph.D.) student at UHasselt/IMO, and M.M. is an SB Ph.D. fellow at FWO (Number 1S20118N). W.T.M.V.G., L.L., and D.V. acknowledge the FWO for the funding of the SBO project PROCEED (FWO-S002019N) and the senior FWO research project G043320N. KVH thanks the Research Foundation – Flanders (FWO) (projects AUGE/11/029 and G099319N) for funding. The work has been carried out in the context of the Solliance network (www.solliance.eu), from which UHasselt is a member. Additionally, UHasselt is a partner in the Energyville Consortium (http://www.energyville.be/about-energyville).
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