Abstract
We present theoretical and experimental results of electron kinetics and transport in quantum dot structures with potential barriers created around dots via intentional or unintentional doping. Monte Carlo simulations demonstrate that photoelectron capture is substantially enhanced in strong fields and electron kinetics can be controlled by potential barriers. Therefore, by creating potential barriers around dots, we found that our novel quantum dots with built-in charge (Q-BIC) solar cells and infrared (IR) photodectors enhance electron intersubband transitions and suppress fast electron capture processes. These factors lead to a 60% increase in the photocurrent of the Q-BIC solar cells (without degradation of the open circuit voltage) and ~25 times increase in the photoresponse of the Q-BIC photodetectors.
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The authors would like to thank Kimberley Olver, Fred Towner, and Gregory Salamo’s group for their contributions.
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Sablon, K.A., Mitin, V., Little, J.W., Sergeev, A., Vagidov, N. (2012). Quantum Dots with Built-in Charge for Enhancing Quantum Dot Solar Cells and Infrared Photodetectors. In: Wang, Z. (eds) Quantum Dot Devices. Lecture Notes in Nanoscale Science and Technology, vol 13. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3570-9_13
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