Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Shankar Karki"'
Autor:
Deewakar Poudel, Benjamin Belfore, Tasnuva Ashrafee, Elizabeth Palmiotti, Shankar Karki, Grace Rajan, Thomas Lepetit, Angus Rockett, Sylvain Marsillac
Publikováno v:
Energies, Vol 14, Iss 13, p 3938 (2021)
Cu(In,Ga)Se2 (or CIGS) thin films and devices were fabricated using a modified three-stage process. Using high deposition rates and a low temperature during the process, a copper chloride vapor treatment was introduced in between the second and third
Externí odkaz:
https://doaj.org/article/408cad56e574483c9c4488d669ac9eb2
Autor:
Deewakar Poudel, Benjamin Belfore, Tasnuva Ashrafee, Shankar Karki, Grace Rajan, Angus Rockett, Sylvain Marsillac
Publikováno v:
Materials, Vol 14, Iss 13, p 3596 (2021)
Cu(In,Ga)Se2 (CIGS) thin films were deposited at low temperature (350 °C) and high rate (10 µm/h) by a single stage process. The effect of post-deposition treatments at 400 °C and 500 °C by indium bromide vapor were studied and compared to the ef
Externí odkaz:
https://doaj.org/article/76b7bc01c3b043c0bb9923d22d535981
Autor:
Orlando Ayala, Benjamin Belfore, Tasnuva Ashrafee, John Akwari, Grace Rajan, Shankar Karki, Deewakar Poudel, Sylvain Marsillac
Publikováno v:
Energies, Vol 14, Iss 9, p 2479 (2021)
In this work, the diffusion process of sodium (Na) in molybdenum (Mo) thin films while it was deposited on soda lime glass (SLG) was studied. A small amount of oxygen was present in the chamber while the direct-current (DC) magnetron sputtering was u
Externí odkaz:
https://doaj.org/article/6ec7cd5f88b44530bd2e956817b98b45
Publikováno v:
Materials, Vol 13, Iss 19, p 4259 (2020)
A new method combining in-situ real-time spectroscopic ellipsometry and optical modeling to optimize the thickness of an anti-reflective (AR) coating for Cu(In,Ga)Se2 (CIGS) solar cells is described and applied directly to fabricate devices. The mode
Externí odkaz:
https://doaj.org/article/d8a5af1dc92243b4915df4f5addd3e45
Autor:
Deewakar Poudel, Shankar Karki, Benjamin Belfore, Grace Rajan, Sushma Swaraj Atluri, Sina Soltanmohammad, Angus Rockett, Sylvain Marsillac
Publikováno v:
Energies, Vol 13, Iss 17, p 4545 (2020)
The impact of moisture ingress on the surface of copper indium gallium diselenide (CIGS) solar cells was studied. While industry-scale modules are encapsulated in specialized polymers and glass, over time, the glass can break and the encapsulant can
Externí odkaz:
https://doaj.org/article/8acdb868e2494ebc9845f64d36aa7a83
Autor:
Grace Rajan, Krishna Aryal, Shankar Karki, Puruswottam Aryal, Robert W. Collins, Sylvain Marsillac
Publikováno v:
Journal of Spectroscopy, Vol 2018 (2018)
In view of the large-scale utilization of Cu(In,Ga)Se2 (CIGS) solar cells for photovoltaic application, it is of interest not only to enhance the conversion efficiency but also to reduce the thickness of the CIGS absorber layer in order to reduce the
Externí odkaz:
https://doaj.org/article/85d9b1d6923841cd936be8e1ef1bbb6c
Autor:
Sylvain Marsillac, Grace Rajan, Julia I. Deitz, Tyler J. Grassman, Angus Rockett, Shankar Karki, Benjamin Belfore, Sina Soltanmohammad, Deewakar Poudel, Gandhari Bhandari
Publikováno v:
IEEE Journal of Photovoltaics. 10:696-702
Solar cell degradation can occur through many pathways and at the different stages of the fabrication process, notably because of the water condensation. In the case of Cu(In,Ga)Se2 (CIGS) solar cells, the impact of water ingress on Mo back contact c
Autor:
Deewakar Poudel, Sylvain Marsillac, Angus Rockett, Shankar Karki, Benjamin Belfore, Grace Rajan
Publikováno v:
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC).
CIGS solar cell degradation due to the impact of moisture and heat treatment was studied as a function of sputtering pressure of the transparent conductive oxide (TCO) deposition. The devices were immersed in deionized water for up to 72 hours. The r
Autor:
Tasnuva Ashrafee, Thomas Lepetit, Shankar Karki, Nicolas Barreau, Grace Rajan, Angus Rockett, Deewakar Poudel, Benjamin Belfore, Sylvain Marsillac, Elizabeth Palmiotti
Publikováno v:
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), Jun 2021, Fort Lauderdale, United States. pp.2307-2311, ⟨10.1109/PVSC43889.2021.9518578⟩
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), Jun 2021, Fort Lauderdale, United States. pp.2307-2311, ⟨10.1109/PVSC43889.2021.9518578⟩
International audience; Cu(In,Ga)Se-2 samples were fabricated using a 3stage thermal co-evaporation process on molybdenum back contact at low temperature. The process of recrystallization was carried out in between the 2nd and 3rd stages by flashing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1c8503a1dfc942c01db5fd3fab3a91c
https://hal.archives-ouvertes.fr/hal-03406920
https://hal.archives-ouvertes.fr/hal-03406920
Autor:
Grace Rajan, Shankar Karki, Sylvain Marsillac, Angus Rockett, Sina Soltanmohammad, Benjamin Belfore, Deewakar Poudel
Publikováno v:
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC).
CIGS solar cells were submitted to damp heat treatment of the window layer by immerging the full devices into deionized water at 50°C for 24 hours. An overall loss in device performance was observed by current-voltage (J-V) measurements after such e