NDLI: Transient absorption for characterization of intermediate band solar cells

Content Provider	IEEE Xplore Digital Library
Author	Kolla, P. Norman, A. Smith, S.
Copyright Year	2010
Description	Author affiliation: Nanoscience and Nanoengineering, South Dakota School of Mines and Technology, Rapid City, 57701, USA (Kolla, P.; Smith, S.) \|\| National Renewable Energy Laboratory, Golden, CO 80401, USA (Norman, A.)
Abstract	We use transient absorption methods to characterize the sequential two-photon absorption in a quantum-dot superlattice 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 photocurrent 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.
Starting Page	001780
Ending Page	001782
File Size	601217
Page Count	3
File Format	PDF
ISBN	9781424458905
ISSN	01608371
e-ISBN	9781424458929
DOI	10.1109/PVSC.2010.5615890
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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