TY - JOUR
T1 - Multiphoton photocurrent in wide bandgap semiconductors for nonlinear optoelectronics
T2 - Comparison of GaP, GaN/InGaN, and SiC
AU - Wang, Chuanliang
AU - Ali, Ahsan
AU - Karki, Khadga Jung
N1 - Publisher Copyright:
© 2024 Author(s).
PY - 2024/2/5
Y1 - 2024/2/5
N2 - Wide bandgap semiconductors are ideally suited for nonlinear optoelectronics. Because their bandgaps are larger than 2 eV, simultaneous absorption of two or more near-infrared photons is necessary to excite the electrons from the valence to the conduction band. Understanding of the processes that affect multiphoton absorption is important in the design and fabrication of optoelectronic devices. Here, we present an overview of the photocurrent response in photodetectors made from GaP, GaN, InGaN, and SiC when they are excited by photons at 1.2 eV. Recent measurements have shown that sub-bandgap absorptions contribute to photocurrent in GaP, and, thus, it is not a good material for nonlinear optoelectronics. Similarly, the response of GaN is affected by long-lived trapped charges. Photocurrents in InGaN and SiC are predominantly from three- and four-photon absorption, respectively. Moreover, these materials can withstand excitation intensities higher than 1011 W cm−2, making them appropriate platforms for nonlinear optoelectronics.
AB - Wide bandgap semiconductors are ideally suited for nonlinear optoelectronics. Because their bandgaps are larger than 2 eV, simultaneous absorption of two or more near-infrared photons is necessary to excite the electrons from the valence to the conduction band. Understanding of the processes that affect multiphoton absorption is important in the design and fabrication of optoelectronic devices. Here, we present an overview of the photocurrent response in photodetectors made from GaP, GaN, InGaN, and SiC when they are excited by photons at 1.2 eV. Recent measurements have shown that sub-bandgap absorptions contribute to photocurrent in GaP, and, thus, it is not a good material for nonlinear optoelectronics. Similarly, the response of GaN is affected by long-lived trapped charges. Photocurrents in InGaN and SiC are predominantly from three- and four-photon absorption, respectively. Moreover, these materials can withstand excitation intensities higher than 1011 W cm−2, making them appropriate platforms for nonlinear optoelectronics.
UR - http://www.scopus.com/inward/record.url?scp=85184137312&partnerID=8YFLogxK
U2 - 10.1063/5.0185815
DO - 10.1063/5.0185815
M3 - 文章
AN - SCOPUS:85184137312
SN - 0003-6951
VL - 124
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 6
M1 - 062101
ER -