Carrier extraction behaviour in type II GaSb/GaAs quantum ring solar cells
Carrier extraction behaviour in type II GaSb/GaAs quantum ring solar cells
复制标题
II 型 GaSb/GaAs 量子环太阳能电池中的载流子提取行为
DOI:
10.1088/0268-1242/29/3/035014
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发表时间:
2014
影响因子:
1.9
通讯作者:
Fujita H
中科院分区:
文献类型:
--
作者:
Fujita H
The introduction of quantum dot (QD) or quantum ring (QR) nanostructures into GaAs single-junction solar cells has shown enhanced photo-response above the GaAs absorption edge, because of sub-bandgap photon absorption. However, to further improve solar cell performance a better understanding of the mechanisms of photogenerated carrier extraction from QDs and QRs is needed. In this work we have used a direct excitation technique to study type II GaSb/GaAs quantum ring solar cells using a 1064 nm infrared laser, which enables us to excite electron–hole pairs directly within the GaSb QRs without exciting the GaAs host material. Temperature and laser intensity dependence of the current–voltage characteristics revealed that the thermionic emission process produced the dominant contribution to the photocurrent and accounts for 98.9% of total photocurrent at 0 V and 300 K. Although the tunnelling process gives only a low contribution to the photocurrent, an enhancement of the tunnelling current was clearly observed when an external electric field was applied.
影响因子:
4
作者:
Carrington P
通讯作者:
Carrington P
影响因子:
3.2
作者:
Hwang, Jinyoung;Martin, Andrew J.;Phillips, Jamie D.
通讯作者:
Phillips, Jamie D.
影响因子:
4
作者:
R. Young;Ep Erwin Smakman;A. Sánchez;P. Hodgson;P. Koenraad;M. Hayne
通讯作者:
M. Hayne