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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19822

Title: Refractive index extraction and thickness optimization of Cu2ZnSnSe4 thin film solar cells
Authors: ElAnzeery, Hossam
El Daif, Ounsi
Buffiere, Marie
Oueslati, Souhaib
Ben Messaoud, Khaled
Agten, Dries
Brammertz, Guy
Guindi, Rafik
Kniknie, Bas
Meuris, Marc
Poortmans, Jef
Issue Date: 2015
Abstract: Cu2ZnSnSe4 (CZTSe) thin film solar cells are promising emergent photovoltaic technologies based on low-bandgap absorber layer with high absorption coefficient. To reduce optical losses in such devices and thus improve their efficiency, numerical simulations of CZTSe solar cells optical characteristics can be performed based on individual optical properties of each layer present in the cell structure. In this contribution, we have first determined the optical coefficients of individual thin films (i.e., (n, k) of the absorber, buffer, and window layers) to build a realistic model simulating the optical behavior of the whole cell stack we propose. Optical characterization was performed using two approaches, one based on ellipsometry measurements for characterizing thin flat cadmium sulfide (CdS) and zinc oxide (ZnO) layers and the other relying on reflectance and transmission (R/T) analysis for the rough CZTSe absorber. Then, we performed numerical simulations using as input experimental optical parameters predicting optimal CZTSe cell structure minimizing optical losses. The impact of each layer’s thickness on the cell’s shortcircuit current has been studied. A set of optimal thicknesses of each of the active layers was proposed. Finally, the proposed optical optimization was experimented practically leading to CZTSe cells with 9.7% and 10.4% efficiencies.
Notes: [ElAnzeery, Hossam; Oueslati, Souhaib; Ben Messaoud, Khaled] KACST IntelConsortium Ctr Excellence Nanomfg Appl, Riyadh, Saudi Arabia. [ElAnzeery, Hossam; El Daif, Ounsi; Buffiere, Marie; Oueslati, Souhaib; Ben Messaoud, Khaled; Agten, Dries; Poortmans, Jef] IMEC, Partner Solliance, B-3001 Leuven, Belgium. [ElAnzeery, Hossam; Guindi, Rafik] Nile Univ, Dept Microelect Syst Design, Cairo, Egypt. [El Daif, Ounsi] Qatar Fdn, QEERI, Doha, Qatar. [Buffiere, Marie; Poortmans, Jef] Katholieke Univ Leuven, Dept Elect Engn, B-3001 Heverlee, Belgium. [Oueslati, Souhaib; Ben Messaoud, Khaled] Fac Sci Tunis, Dept Phys, El Manar, Tunisia. [Brammertz, Guy; Meuris, Marc] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Brammertz, Guy; Meuris, Marc] IMEC, Div IMOMEC Partner Solliance, B-3590 Diepenbeek, Belgium. [Kniknie, Bas] TNO, NL-5612 AP Eindhoven, Netherlands.
URI: http://hdl.handle.net/1942/19822
DOI: 10.1002/pssa.201431807
ISI #: 000362950800016
ISSN: 1862-6300
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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