Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N32: Novel Semiconductors Thin Film Growth and Characterization
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 224
Sponsoring
Unit:
DCMP
Chair: Mariana Fazio, University of Strathclyde
Abstract: N32.00004 : Laser assisted formation of locally defined Cu(In,Ga)Se2 microstructures*
12:06 PM–12:18 PM
Author not Attending
Presenter:
Setareh Zahedi Azad
(Leibniz Institute for crystal growth)
Authors:
Setareh Zahedi Azad
(Leibniz Institute for crystal growth)
Owen.C. Ernst
(Leibniz Institute for crystal growth)
Torsten Boeck
(Leibniz Institute for crystal growth)
Collaboration:
IKZ
Our results show that the selective formation of In and Ga islands on molybdenum-coated soda-lime glass-substrates is possible by using an optical system integrated into a metal organic chemical vapor deposition (MOCVD) chamber. For this purpose, an infrared laser is integrated with a diffractive optical element (DOE). The DOE diffracts the incident beam into a matrix of 7*7 output beams. The output beams which are directed to the substrate are absorbed in the molybdenum and heat it locally.
At the same time, the metal organic precursor gases trimethylindium and triethylgallium diluted by the carrier gas (here N2) are introduced into the chamber. The local heating of the substrate decomposes the precursor and leads to the growth of metal islands (here indium and gallium). As a result, the nucleation of In and Ga islands can be locally controlled by this sophisticated heating setup. Subsequent evaporation of copper in a PVD-chamber followed by selenization leads to the formation of Cu(In,Ga)Se2 islands that can serve as micro-absorbers. Since the size and pattern of the formed Cu(In,Ga)Se2 islands can be easily controlled using this laser-heating/DOE-setup, this novel method can also be applied to large-scale production.
*This work is supported by Federal Ministry for Economic Affairs and Climate Action under the Contract Nr. 03EE1029A.
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