Direct determination of minority carrier diffusion lengths at axial GaAs nanowire p-n junctions

Nano Letters
Christoph GutscheFranz-Josef Tegude

Abstract

Axial GaAs nanowire p-n diodes, possibly one of the core elements of future nanowire solar cells and light emitters, were grown via the Au-assisted vapor-liquid-solid mode, contacted by electron beam lithography, and investigated using electron beam induced current measurements. The minority carrier diffusion lengths and dynamics of both, electrons and holes, were determined directly at the vicinity of the p-n junction. The generated photocurrent shows an exponential decay on both sides of the junction and the extracted diffusion lengths are about 1 order of magnitude lower compared to bulk material due to surface recombination. Moreover, the observed strong diameter-dependence is well in line with the surface-to-volume ratio of semiconductor nanowires. Estimating the surface recombination velocities clearly indicates a nonabrupt p-n junction, which is in essential agreement with the model of delayed dopant incorporation in the Au-assisted vapor-liquid-solid mechanism. Surface passivation using ammonium sulfide effectively reduces the surface recombination and thus leads to higher minority carrier diffusion lengths.

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Citations

Aug 24, 2013·ACS Applied Materials & Interfaces·Carlos M HangarterDaniel Josell
Mar 8, 2013·Nano Letters·Patrick ParkinsonChennupati Jagadish
Dec 30, 2014·Nano Letters·Guannan ChenJonathan E Spanier
Sep 19, 2014·Nano Letters·Hannah J JoyceMichael B Johnston
Aug 19, 2015·ACS Applied Materials & Interfaces·Ning HanJohnny C Ho
Aug 2, 2015·Nanoscale Research Letters·M ZervosC R Luculescu
Jun 18, 2016·Nature Communications·Tim BurgessChennupati Jagadish
May 20, 2014·Nano Letters·P TchoulfianJ Pernot
Aug 27, 2014·ACS Applied Materials & Interfaces·Daniel JosellNhan V Nguyen
Jan 10, 2018·Nanotechnology·Fabrice Donatini, Julien Pernot
Nov 14, 2017·Nanotechnology·Zhihua FangJulien Pernot
Aug 24, 2018·Nanotechnology·Lert ChayanunJesper Wallentin
Jan 19, 2019·Journal of Synchrotron Radiation·Lert ChayanunJesper Wallentin
Jun 16, 2012·Nanotechnology·M TchernychevaL Largeau
Nov 1, 2018·Nanotechnology·Mingze YangKaren L Kavanagh
Sep 20, 2020·Nature Communications·Maximilian ZapfCarsten Ronning
Jul 17, 2012·Nanotechnology·N TajikR R LaPierre
Nov 16, 2019·Nanoscale Research Letters·Marcelo Rizzo PitonMircea Guina
Dec 18, 2019·Nature Communications·Yasen HouDong Yu

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