Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Lead trihalide perovskites based-solar cells are steadily becoming the most promising photovoltaic technology. Single-junction perovskite photovoltaic devices achieved PCE of over 23% in 2018. The application of multi-junction solar cells, including lead trihalides, along with other semiconductors is another approach that may increase the overall efficiency of photovoltaic devices. The superior properties of semiconductor QDs, such as the tunability of the optical band gap across a wide range of energies and high light absorption, make these materials attractive for multi-junction solar cells, and LEDs. [1,2]
Herein we present and discuss our time-resolved spectroscopic studies of the photoinduced processes in methylammonium perovskite polycrystalline films containing PbS quantum dots (QDs).[3] The modeling of the experimental results of the femtosecond transient absorption (TA) and sub-picosecond terahertz (THz) spectroscopies allow to get a detailed picture of the electrons and holes recombination processes at perovskite/PbS interfaces. We show that ultrafast and efficient transition of the initially photoformed charge carriers in perovskite matrix to PbS QDs within few hundred picoseconds. Interestingly, the electron is effectively transferred to QDs with a rate constant of 1.2×1010 s−1, despite the fact that the conduction band of QDs is higher than that of perovskite. The process occurs due to presence of perovskite/QDs interfacial trap states. The hole transfer between valence bands of both components happens with rate constant of 1.2×1010 s−1.
References
1. J. Tang, H. Liu, D. Zhitomirsky, S. Hoogland, X. Wang, M. Furukawa, L. Levina, L., E. H. Sargent, Nano Lett., 2012, 12, 4889-4894.
2. C. -H. M. Chuang, P. R. Brown, V. Bulović, M. G. Bawendi, M. G. Nature Mater. 2014, 13, 796-801
3. P. Galar P. Piatkowskia,T. T. Ngo, M. Gutiérrez, I. Mora-Seró, A. Douhal, Nano Energy 2018, 49, 471–480.
This work was supported by Ministry of Economy and Competitiveness in Spain [MAT2014-57646-P, MAT2016-76892-C3-1- R], Junta de Comunidades de Castilla-La Mancha in Spain [PEII-2014-003-P], and European Research Council (ERC) via Consolidator Grant (724424 - No-LIMIT). The work at University of Warsaw, Department of chemistry was supported by NCN (Poland) through project No. 501-D112-66-0005753.
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