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Ultralow Self-Doping in Two-dimensional Hybrid Perovskite Single Crystals
Open accessAbstract
Abstract Unintentional self-doping in semiconductors through shallow defects is detrimental to optoelectronic device performance. It adversely affects junction properties and it introduces electronic noise. This is especially acute for solution-processed semiconductors, including hybrid perovskites, which are usually high in defects due to rapid crystallization. Here, we uncover extremely low self-doping concentrations in single crystals of the two-dimensional perovskites (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n−1 (n = 1, 2, and 3), over three orders of magnitude lower than those of typical three-dimensional hybrid perovskites, by analyzing their conductivity behavior. We propose that crystallization of hybrid perovskites containing large organic cations suppresses defect formation and thus favors a low self-doping level. To exemplify the benefits of this effect, we demonstrate extraordinarily high light-detectivity (1013 Jones) in (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n−1 photoconductors due to the reduced electronic noise, which makes them particularly attractive for the detection of weak light signals. Furthermore, the low self-doping concentration reduces the equilibrium charge carrier concentration in (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n−1, advantageous in the design of p–i–n heterojunction solar cells by optimizing band alignment and promoting carrier depletion in the intrinsic perovskite layer, thereby enhancing charge extraction.
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Cites
Ambipolar solution-processed hybrid perovskite phototransistors
Li, F., Ma, C., Wang, H., Hu, W., Yu, W., Sheikh, A. D., & Wu, T. (2015) · Nature Communications · doi:10.1038/ncomms9238 · Cited by 629
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Self-citationStable high efficiency two-dimensional perovskite solar cells via cesium doping
Zhang, X., Ren, X., Liu, B., Munir, R., Zhu, X., Yang, D., Li, J., Liu, Y., Smilgies, D.-M., Li, R., et al. (2017) · Energy & Environmental Science · doi:10.1039/c7ee01145h · Cited by 678
Low‐Dimensional Metal Halide Perovskite Photodetectors
Wang, H., Li, S., Liu, X., Shi, Z., Fang, X., & He, J. (2021) · Advanced Materials · doi:10.1002/adma.202003309 · Cited by 574
Self-citationReduced-Dimensional α-CsPbX3 Perovskites for Efficient and Stable Photovoltaics
Jiang, Y., Yuan, J., Ni, Y., Yang, J., Wang, Y., Jiu, T., Yuan, M., & Chen, J. (2018) · Joule · doi:10.1016/j.joule.2018.05.004 · Cited by 429
Lead-Free Perovskite Materials for Solar Cells
Wang, M., Wang, W., Ma, B., Shen, W., Liu, L., Cao, K., Chen, S., & Huang, W. (2021) · Nano-Micro Letters · doi:10.1007/s40820-020-00578-z · Cited by 423
Metadata
- Authors
- Peng, W., Yin, J., Ho, K.-T., Ouellette, O., De Bastiani, M., Murali, B., El Tall, O., Shen, C., Miao, X., Pan, J., Alarousu, E., He, J.-H., Ooi, B. S., Mohammed, O. F., Sargent, E., & Bakr, O. M.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-06-28
- Volume
- 17
- Issue
- 8
- Pages
- 4759-4767
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2733171239
- Cited by
- 304
- References
- 1
- FWCI
- 16.00
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Peng, W., Yin, J., Ho, K.-T., Ouellette, O., De Bastiani, M., Murali, B., El Tall, O., Shen, C., Miao, X., Pan, J., Alarousu, E., He, J.-H., Ooi, B. S., Mohammed, O. F., Sargent, E., & Bakr, O. M. (2017). Ultralow Self-Doping in Two-dimensional Hybrid Perovskite Single Crystals. Nano Letters. https://doi.org/10.1021/acs.nanolett.7b01475
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