Affiliation:
1. The Blackett Laboratory Department of Physics Imperial College London London SW72AZ UK
2. School of Photovoltaic & Renewable Energy Engineering UNSW Sydney Kensington NSW Sydney 2052 Australia
Abstract
An intermediate band solar cell which generates photocurrent due to sequential absorption of two sub‐bandgap photons at temperatures up to 300 K was realized. The intermediate band is comprised of a “quantum ratchet” semiconductor nanostructure which is designed to store the photoelectron in a long‐lived state that allows for efficient optical re‐absorption; it incorporates a potential barrier designed to both increase the confinement of electrons and reduce thermal escape. This leads to extended electron lifetimes in the ratchet state and room temperature operation. At low temperature (≈12 K), electrons exhibit a ratchet state lifetime of τRB > 100 s, representing an increase by a factor of ≈107 over a device without the barrier.
Funder
Engineering and Physical Sciences Research Council
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
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