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Analysis of Multivalley and Multibandgap Absorption and Enhancement of Free Carriers Related to Exciton Screening in Hybrid Perovskites
Open accessAbstract
Solution-processable metal–halide perovskites recently opened a new route toward low-cost manufacture of photovoltaic cells. Converting sunlight into electrical energy depends on several factors among which a broad absorption across the solar spectrum and attractive charge transport properties are of primary importance. Hybrid perovskites meet such prerequisites, but despite foremost experimental research efforts, their understanding remains scanty. Here we show that in these materials the appropriate absorption and transport properties are afforded by the multibandgap and multivalley nature of their band structure. We also investigate the nature of the photoexcited species. Our analysis suggests exciton screening by collective orientational motion of the organic cations at room temperature, leading to almost free carriers. Molecular collective motion is also expected to couple to carrier diffusion at room temperature. In mixed halides, our interpretation indicates that doping might hinder collective molecular motions, leading to good transport properties despite alloying and local lattice strain.
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Stranks, S. D., Eperon, G. E., Grancini, G., Menelaou, C., Alcocer, M. J. P., Leijtens, T., Herz, L. M., Petrozza, A., & Snaith, H. J. (2013) · Science · doi:10.1126/science.1243982 · Cited by 10,413
Kim, H.-S., Lee, C.-R., Im, J.-H., Lee, K.-B., Moehl, T., Marchioro, A., Moon, S.-J., Humphry-Baker, R., Yum, J.-H., Moser, J. E., et al. (2012) · Scientific Reports · doi:10.1038/srep00591 · Cited by 8,092
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Self-citationCharge-Carrier Dynamics in Organic-Inorganic Metal Halide Perovskites
Herz, L. M. (2016) · Annual Review of Physical Chemistry · doi:10.1146/annurev-physchem-040215-112222 · Cited by 819
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Neukirch, A. J., Nie, W., Blancon, J.-C., Appavoo, K., Tsai, H., Sfeir, M. Y., Katan, C., Pedesseau, L., Even, J., Crochet, J. J., et al. (2016) · Nano Letters · doi:10.1021/acs.nanolett.6b01218 · Cited by 299
Self-citationStructured Organic–Inorganic Perovskite toward a Distributed Feedback Laser
Saliba, M., Wood, S. M., Patel, J. B., Nayak, P. K., Huang, J., Alexander‐Webber, J. A., Wenger, B., Stranks, S. D., Hörantner, M. T., Wang, J. T., et al. (2016) · Advanced Materials · doi:10.1002/adma.201502608 · Cited by 297
Diode-Pumped Organo-Lead Halide Perovskite Lasing in a Metal-Clad Distributed Feedback Resonator
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Photophysics of Hybrid Lead Halide Perovskites: The Role of Microstructure
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Metadata
- Authors
- Even, J., Pedesseau, L., & Katan, C.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-05-21
- Volume
- 118
- Issue
- 22
- Pages
- 11566-11572
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2320924056
- Cited by
- 556
- References
- 2
- FWCI
- 39.62
- Type
- journal article
- Language
- en
- Open access
- green
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