Efficient carrier multiplication in CsPbI3 perovskite nanocrystals

Chris Weerd (), Leyre Gomez, Antonio Capretti, Delphine M. Lebrun, Eiichi Matsubara, Junhao Lin, Masaaki Ashida, Frank C. M. Spoor, Laurens D. A. Siebbeles, Arjan J. Houtepen, Kazutomo Suenaga, Yasufumi Fujiwara and Tom Gregorkiewicz ()
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Chris Weerd: University of Amsterdam
Leyre Gomez: University of Amsterdam
Antonio Capretti: University of Amsterdam
Delphine M. Lebrun: Osaka University, 2-1 Yamadaoka
Eiichi Matsubara: Osaka Dental University, 8-1 Kuzuha-Hanazono
Junhao Lin: Southern University of Science and Technology
Masaaki Ashida: Osaka University, 1-3 Machikaneyama
Frank C. M. Spoor: Delft University of Technology building 58, van der Maasweg 9
Laurens D. A. Siebbeles: Delft University of Technology building 58, van der Maasweg 9
Arjan J. Houtepen: Delft University of Technology building 58, van der Maasweg 9
Kazutomo Suenaga: AIST Central 5
Yasufumi Fujiwara: Osaka University, 2-1 Yamadaoka
Tom Gregorkiewicz: University of Amsterdam

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract The all-inorganic perovskite nanocrystals are currently in the research spotlight owing to their physical stability and superior optical properties—these features make them interesting for optoelectronic and photovoltaic applications. Here, we report on the observation of highly efficient carrier multiplication in colloidal CsPbI3 nanocrystals prepared by a hot-injection method. The carrier multiplication process counteracts thermalization of hot carriers and as such provides the potential to increase the conversion efficiency of solar cells. We demonstrate that carrier multiplication commences at the threshold excitation energy near the energy conservation limit of twice the band gap, and has step-like characteristics with an extremely high quantum yield of up to 98%. Using ultrahigh temporal resolution, we show that carrier multiplication induces a longer build-up of the free carrier concentration, thus providing important insights into the physical mechanism responsible for this phenomenon. The evidence is obtained using three independent experimental approaches, and is conclusive.

Date: 2018
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DOI: 10.1038/s41467-018-06721-0

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