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Elucidating the role of disorder and free-carrier recombination kinetics in CH_3NH_3PbI_3 perovskite films

La-o-vorakiat, Chan and Salim, Teddy and Kadro, Jeannette and Khuc, Mai-Thu and Haselsberger, Reinhard and Cheng, Liang and Xia, Huanxin and Gurzadyan, Gagik G. and Su, Haibin and Lam, Yeng Ming and Marcus, Rudolph A. and Michel-Beyerle, Maria-Elisabeth and Chia, Elbert E. M. (2015) Elucidating the role of disorder and free-carrier recombination kinetics in CH_3NH_3PbI_3 perovskite films. Nature Communications, 6 (7). Art. No. 7903. ISSN 2041-1723. PMCID PMC4532878.

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Apart from broadband absorption of solar radiation, the performance of photovoltaic devices is governed by the density and mobility of photogenerated charge carriers. The latter parameters indicate how many free carriers move away from their origin, and how fast, before loss mechanisms such as carrier recombination occur. However, only lower bounds of these parameters are usually obtained. Here we independently determine both density and mobility of charge carriers in a perovskite film by the use of time-resolved terahertz spectroscopy. Our data reveal the modification of the free carrier response by strong backscattering expected from these heavily disordered perovskite films. The results for different phases and different temperatures show a change of kinetics from two-body recombination at room temperature to three-body recombination at low temperatures. Our results suggest that perovskite-based solar cells can perform well even at low temperatures as long as the three-body recombination has not become predominant.

Item Type:Article
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URLURL TypeDescription Information CentralArticle
La-o-vorakiat, Chan0000-0002-0231-8499
Su, Haibin0000-0001-9760-6567
Lam, Yeng Ming0000-0001-9390-8074
Marcus, Rudolph A.0000-0001-6547-1469
Chia, Elbert E. M.0000-0003-2066-0834
Additional Information:© 2015 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit Received 08 December 2014; Accepted 24 June 2015; Published 30 July 2015. E.E.M.C. acknowledges support from Singapore Ministry of Education AcRF Tier 1 (RG13/12 and RG123/14), and the National Research Foundation Competitive Research Programme (NRF-CRP4-2008-04). R.A.M. thanks the ONR and ARO for their support. M.-E.M.-B. is grateful to the Nanyang Technological University for supporting the Biophysics Center. H.S. wishes to thank the support from A*STAR SERC (Grant no. 1223600006, 1121202012). Y.M.L. acknowledges support from the Danish Council for Strategic Research under the CHASOL project and also BMBF/NTU under the 1°N Programme. Contributions: M.-E.M.-B. and E.E.M.C. conceived the project. C.L. designed the TRTS experiments. C.L., L.C. and H.X. performed the TRTS experiments. C.L., L.C., R.A.M., M.-E.M.-B. and E.E.M.C. analysed the data. M.T.K. and R.H. performed the absorption spectroscopy experiments. T.S., J.K. and Y.M.L. provided the perovskite samples. C.L., R.A.M., M.-E.M.-B. and E.E.M.C. wrote the manuscript. All authors discussed and improved the manuscript. The authors declare no competing financial interests.
Funding AgencyGrant Number
Ministry of Education (Singapore)RG13/12
Ministry of Education (Singapore)RG123/14
National Research Foundation of KoreaNRF-CRP4-2008-04
Office of Naval Research (ONR)UNSPECIFIED
Army Research Office (ARO)UNSPECIFIED
Agency for Science, Technology and Research (A*STAR)1223600006
Agency for Science, Technology and Research (A*STAR)1121202012
Danish Council for Strategic ResearchUNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Nanyang Technological University (NTU)UNSPECIFIED
Issue or Number:7
PubMed Central ID:PMC4532878
Record Number:CaltechAUTHORS:20150821-154456315
Persistent URL:
Official Citation:La-o-vorakiat, C. et al. Elucidating the role of disorder and free-carrier recombination kinetics in CH3NH3PbI3 perovskite films. Nat. Commun. 6:7903 doi: 10.1038/ncomms8903 (2015).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59818
Deposited By: George Porter
Deposited On:24 Aug 2015 17:11
Last Modified:09 Mar 2020 13:19

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