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Transient Absorption for Characterization of Quantum Dot Intermediate Band Solar Cells

Published online by Cambridge University Press:  16 September 2011

Praveen Kolla ,
Andrew Norman  and
Steve Smith
Praveen Kolla
Affiliation:
South Dakota School of Mines and Technology, Rapid City, South Dakota.
Andrew Norman
Affiliation:
NREL, Golden, Colorado.
Steve Smith*
Affiliation:
South Dakota School of Mines and Technology, Rapid City, South Dakota.
*
*Corresponding Author: Steve_Smith@mailaps.org
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Abstract

We use transient absorption methods to characterize the sequential two-photon absorption in a quantum-dot super-lattice based intermediate band solar cell (QD-IBSC). Using collinear, orthogonally polarized beams generated from an Optical Parametric Oscillator (OPO) at varying time delay, tuned stepwise from 1050nm to 1250nm, we use the solar cell photocurrent as a direct measure of the transient absorption by measuring the differential photo-current as a function of time delay between two energetically degenerate, 100fs pulses. For comparison, we measure the pulse autocorrelation in the same geometry using a GaAsP photodiode, where all observed photocurrent is derived from instantaneous two-photon absorption. Our measurements show that at high intensity, the measurement is dominated by instantaneous two photon absorption, with a simultaneous sequential two-photon photocurrent which persists beyond the pulse overlap. Our measurements demonstrate the method can reveal carrier dynamics in a working QD-IBSC, and their dependence on energy. The method could potentially give details of the band structure formed in the QD-IBSC. Such knowledge may benefit device development and future designs of IBSCs based on QD superlattices or alternative intermediate band materials or device structures.

Keywords

semiconductingphotovoltaicoptical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1289: Symposium H – Controlling Material Properties and Charge-Carrier Interactions with Quantum-Dot Coupling , 2011 , mrsf10-1289-h04-02
Copyright
Copyright © Materials Research Society 2011

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References

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