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Listar por autor "Ullah, Shafi"

Mostrando ítems 1-14 de 14

Baseline of numerical simulations for ZnTe based thin-film solar cells

Ullah, Hanif; Ullah, Shafi; Marí, B. (Institute of Electrical and Electronics Engineers (IEEE), 2016)

Abstract Numerical modelling of photovoltaic solar cells is an important strategy to test the viability of proposed physical structures and their performance. This article introduces the concept of numerical simulation ...
Electrochemical Fabrication and Characterization of p-CuSCN/n-Fe2O3 Heterojunction Devices for Hydrogen Production

Bouhjar, Feriel; Ullah, Shafi; Mollar García, Miguel Alfonso; Marí, B.; Bessais, Brahim (The Electrochemical Society, 2017)

[EN] p-CuSCN/n-Fe2O3 heterojunctions were electrochemically prepared by sequentially depositing alpha-Fe2O3 and CuSCN films on FTO (SnO2:F) substrates. Both alpha-Fe2O3 and CuSCN films and alpha-Fe2O3/CuSCN heterojunctions ...
Electrodeposition of CuGaSe2 and CuGaS2 thin films for photovoltaic applications

Ullah, Shafi; Mollar García, Miguel Alfonso; Marí, B. (Springer Verlag (Germany), 2016-08)

Abstract CuGaSe2 and CuGaS2 polycrystalline thin film absorbers were prepared by one-step electrodeposition from an aqueous electrolyte containing CuCl2, GaCl3 and H2SeO3. The pH of the solution was adjusted to 2.3 by ...
Enhancement of the conversion efficiency of thin film kesterite solar cell

Khattak, Yousaf Hameed; Baig, Faisal; Ullah, Shafi; Marí, B.; Ullah, Hanif (American Institute of Physics, 2018)

[EN] Cu2ZnSnS4(CZTS) is a non-toxic earth abundant material and a promising quaternary semiconductor compound of groups I - II - IV - VI having a kesterite symmetrical structure. Due to its optimum direct bandgap, it has ...
Influence of a Compact Fe2O3 Layer on the Photovoltaic Performance of Perovskite-Based Solar Cells

Bouhjar, F.; Mollar García, Miguel Alfonso; Ullah, Shafi; Marí, B.; Bessais, B. (The Electrochemical Society, 2018)

[EN] In this study, uniform and dense iron oxide ¿-Fe2O3 thin films were used as an electron-transport layer (ETL) in CH3NH3PbI3-based perovskite solar cells (PSCs), replacing the Titanium dioxide (TiO2) ETL conventionally ...
Influence of Fe Content in Binary SnS2 Synthesis by Hydrothermal Technique for Photovoltaic Application

Ullah, Shafi; Bouich, Amal; Ullah, Hanif; Vega-Fleitas, Erica; Baig, Faisal; Hameed, Yousaf; Mollar García, Miguel Alfonso; Marí, B. (The Electrochemical Society, 2019-06-18)

[EN] Binary thin disulfide (SnS2) and ternary Sn1-x FexS2 (X = Fe (2.5%, 5% and 10%) which has huge potentials in the visible-light rang due to its bandgap 2.2-2.6 eV. Herein, SnS2 and Sn1-x FexS2 powders have been synthesize ...
Influence of P+ - ZnTe back surface contact on photovoltaic performance of ZnTe based solar cells

Bayad, Hamza; Elmanouni, Ahmed; Marí, B.; Khattak, Yousaf Hameed; Ullah, Shafi; Baig, Faisal (Springer-Verlag, 2018)

[EN] In order to improve photovoltaic performance of solar cells based on ZnTe thin films two device structures have been proposed and its photovoltaic parameters have been numerically simulated using Solar Cell Capacitance ...
Influence of Zinc Content in Ternary ZnCdS Films Deposited by Chemical Bath Deposition for Photovoltaic Applications

Ullah, Shafi; Ullah, Hanif; Bouhjar, F.; Mollar García, Miguel Alfonso; Marí, B.; Chahboun, Adil (The Electrochemical Society, 2018-07-03)

[EN] Cadmium Zinc Sulfide thin films with different Zn concentration were synthesized in aqueous solution by chemical bath deposition (CBD) method using CdSO4, ZnSO4, CH4N2S for Cd+2, Zn+2, and S¿2 ions source, respectively. ...
Numerical analysis a guide to improve the efficiency of experimentally designed solar cell

Baig, Faisal; Khattak, Yousaf Hameed; Ullah, Shafi; Marí, B.; Ullah, Hanif (Springer-Verlag, 2018)

[EN] In this paper a numerical modelling guide is proposed about how to improve the efficiency of experimentally designed solar cells with the aid of numerical analysis. To validate the study presented in this paper, we ...
Numerical Modeling Baseline for high efficiency (Cu2FeSnS4) CFTS based Thin Film Kesterite Solar Cell

Khattak, Yousaf Hameed; Baig, Faisal; Ullah, Shafi; Marí, B.; Ullah, Hanif (Elsevier, 2018-07)

[EN] Cu2FeSnS4 (CFTS) is auspicious nontoxic and earth abundant semiconductor compound having kesterite symmetrical structure. It is an attractive and suitable material for the fabrication of low cost, high efficiency and ...
Optoelectronic characterization of CuInGa(S)2 thin films grown by spray pyrolysis for photovoltaic application

Bouich, Amal; Hartiti, Bouchaib; Ullah, Shafi; Ullah, Hanif; Ebn Touhami, Mohamed; Santos, D. M. F.; Marí, B. (Springer-Verlag, 2019-08-03)

[EN] Copper-indium gallium disulfide (CIGS) is a good absorber for photovoltaic application. Thin films of CIGS were prepared by spray pyrolysis on glass substrates in the ambient atmosphere. The films were characterized ...
Sustainable development with photovoltaic energy in India and Pakistan

Guaita Pradas, Inmaculada; Ullah, Shafi; Marí Soucase, Bernabé (International Journal of Renewable Energy Research, 2015)

[EN] The development and massive use of renewable energy depends on two main factothe use of Reuse rs: progress of related technologies and dedicated incentive policies. Improvement of technology is highly dependent on ...
Synthesis of in-gap band CuGaS2:Cr absorbers and numerical assessment of their performance in solar cells

Ullah, Shafi; Ullah, Hanif; Bouhjar, Feriel; Mollar García, Miguel Alfonso; Marí, B. (Elsevier, 2018)

[EN] CuGaS2 thin films were obtained by sulfurization of CuGaSe2. CuGaSe2 thin films were first electrodeposited from aqueous solutions containing CuCl2, GaCl3, and H2SeO3 and subsequently annealed at 400 °C for 10 min in ...
THIN FILM SOLAR CELLS BASED ON COPPER-INDIUMGALIUM SELENIDE (CIGS) MATERIALS DEPOSITED BY ELECTROCHEMICAL TECHNIQUES

Ullah, Shafi (Universitat Politècnica de València, 2017-09-04)

The improvement of low cost, efficient photovoltaic devices is a leading technological challenge in the recent decade. There is a need to develop scalable and high-throughput manufacturing techniques that could reduce costs ...