1. Carrier dynamics and phonon properties of hafnium nitride: Potential hot carrier solar cell absorber
- Author
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Neeti Gupta, Gavin Conibeer, Hongze Xia, Santosh Shrestha, Xiaoming Wen, Yu Feng, Simon Chung, and Shujuan Huang
- Subjects
Materials science ,business.industry ,Phonon ,chemistry.chemical_element ,Nitride ,Nanosecond ,Hafnium ,law.invention ,Condensed Matter::Materials Science ,symbols.namesake ,chemistry ,law ,Ultrafast laser spectroscopy ,Solar cell ,symbols ,Optoelectronics ,business ,Raman spectroscopy ,Absorption (electromagnetic radiation) - Abstract
Hot carrier solar cells aims to circumvent fundamental loss mechanisms by extracting carriers before thermalization of hot carriers occurs while also minimizing sub-bandgap losses. The absorber must be able to maintain a hot carrier for a sufficiently long time. Hafnium nitride owing to its phononic properties to slow carrier thermalization is a potential absorber for the hot carrier solar cell. The phonon properties have been measured by Raman spectroscopy. The carrier dynamics in hafnium nitride has been studied by ultrafast pump-probe transient absorption where nanosecond long lifetimes have been observed. The carrier temperature has been extracted from the transient absorption spectra to show the carrier temperature remained above 350 K for a long time with a decay time constant of 1.2 ns. more...
- Published
- 2015
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