TY - JOUR
T1 - Efficient carrier multiplication in CsPbI3 perovskite nanocrystals
AU - de Weerd, Chris
AU - Gomez, Leyre
AU - Capretti, Antonio
AU - Lebrun, Delphine M.
AU - Matsubara, Eiichi
AU - Lin, Junhao
AU - Ashida, Masaaki
AU - Spoor, Frank C.M.
AU - Siebbeles, Laurens D.A.
AU - Houtepen, Arjan J.
AU - Suenaga, Kazutomo
AU - Fujiwara, Yasufumi
AU - Gregorkiewicz, Tom
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85054746988&partnerID=8YFLogxK
U2 - 10.1038/s41467-018-06721-0
DO - 10.1038/s41467-018-06721-0
M3 - Article
C2 - 30305623
AN - SCOPUS:85054746988
SN - 2041-1723
VL - 9
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 4199
ER -