TY - JOUR
T1 - N-type GaAs photoanodes in acetonitrile
T2 - Design of a 10.0% efficient photoelectrode
AU - Gronet, Chris M.
AU - Lewis, Nathan S.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1983
Y1 - 1983
N2 - n-type GaAs semiconductor/liquid junctions have been studied in acetonitrile (ACN) solvent with the ferrocene/ferricenium redox couple. Previously reported inefficiencies in this system are demonstrated to be due to bulk electron-hole recombination and not to recombination at the junction. Increases in minority-carrier collection length lead to increases in short circuit current of the n-GaAs/ferrocene/ferricenium cell in ACN, with photocurrent densities in excess of 21 mA/cm2 at 88 mW/cm2 of ELH-type tungsten-halogen irradiation. Properly prepared n-GaAs samples yield photoelectrode efficiencies of 10.0%±0.5% for conversion of natural sunlight (65 mW/cm2) to electricity, with open circuit voltages Voc of 0.70-0.72 V, short circuit currents of 16-17 mA/cm 2, and fill factors of 0.52-0.56, when measured relative to the potential of a reversible reference electrode in the same solvent/redox couple/electrolyte solution.
AB - n-type GaAs semiconductor/liquid junctions have been studied in acetonitrile (ACN) solvent with the ferrocene/ferricenium redox couple. Previously reported inefficiencies in this system are demonstrated to be due to bulk electron-hole recombination and not to recombination at the junction. Increases in minority-carrier collection length lead to increases in short circuit current of the n-GaAs/ferrocene/ferricenium cell in ACN, with photocurrent densities in excess of 21 mA/cm2 at 88 mW/cm2 of ELH-type tungsten-halogen irradiation. Properly prepared n-GaAs samples yield photoelectrode efficiencies of 10.0%±0.5% for conversion of natural sunlight (65 mW/cm2) to electricity, with open circuit voltages Voc of 0.70-0.72 V, short circuit currents of 16-17 mA/cm 2, and fill factors of 0.52-0.56, when measured relative to the potential of a reversible reference electrode in the same solvent/redox couple/electrolyte solution.
UR - http://www.scopus.com/inward/record.url?scp=0041405148&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0041405148&partnerID=8YFLogxK
U2 - 10.1063/1.94148
DO - 10.1063/1.94148
M3 - Article
AN - SCOPUS:0041405148
VL - 43
SP - 115
EP - 117
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 1
ER -