Open AccessVertical InGaN-based green-band solar cells operating under high solar concentration up to 300 suns
Author(s) -
Jinn-Kong Sheu,
Fu Bang Chen,
Shou Hung Wu,
Ming Lun Lee,
Po Cheng Chen,
Yu Min Yeh
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.0a1222
Subject(s) - suns in alchemy , materials science , optoelectronics , energy conversion efficiency , wafer , optics , solar cell , short circuit , substrate (aquarium) , layer (electronics) , solar simulator , plasmonic solar cell , reflector (photography) , polymer solar cell , voltage , composite material , oceanography , physics , quantum mechanics , geology , light source
InGaN/GaN-based solar cells with vertical-conduction feature on silicon substrates were fabricated by wafer bonding technique. The vertical solar cells with a metal reflector sandwiched between the GaN-based epitaxial layers and the Si substrate could increase the effective thickness of the absorption layer. Given that the thermally resistive sapphire substrates were replaced by the Si substrate with high thermal conductivity, the solar cells did not show degradation in power conversion efficiency (PCE) even when the solar concentrations were increased to 300 suns. The open circuit voltage increased from 1.90 V to 2.15 V and the fill factor increased from 0.55 to 0.58 when the concentrations were increased from 1 sun to 300 suns. With the 300-sun illumination, the PCE was enhanced by approximately 33% compared with the 1-sun illumination.