CZTS SOLAR CELL THESIS

Materials Science and Engineering. If the method for removing the semi-metallic CuS from the surface of CZTS films was accomplished, the window of production condition will be widened. CZTS can lead to production of nontoxic thin film solar cells with high absorption coefficient. The melting point of tin sulphides and copper sulphides are lower than that of zinc sulphide, and Cu atoms aggregate easily in the films [48]. A strong effect of the tin content on the bandgap energy, sub-gap absorption coefficient, crystalline domain and grain size is shown and a model based on the increase of the intrinsic defect density induced by a reduced tin content is proposed. Efficiency limitations for wide-band-gap chalcopyrite solar cells.

In n a direct baandgap semiconductor, an a electron m making a traansition from thhe valance band to the co onduction baand can do so o without a change in moomentum [3].. A strong effect of the tin content on the bandgap energy, sub-gap absorption coefficient, crystalline domain and grain size is shown and a model based on the increase of the intrinsic defect density induced by a reduced tin content is proposed. In this work, CZTS thin films were grown using two different processes, based on vacuum deposition of precursors, followed by a heat treatment in sulphur atmosphere. It is believed that the abrupt change of the Cu and Sn contents with the RF power depend upon the plasma density. CZTS samples produced from stacked evaporated precursors allowed achieving a maximum efficiency of 3. The precursors were deposited using two different approaches: CZTS thin films were then assembled into the solar cells and their properties as absorber layer were optimized by varying both composition and thickness.

The relationship between the absorber layer stoichiometry and the device performances was investigated: Abstract Cu2ZnSnS4 CZTS quaternary compound has attracted much attention in the last years as new abundant, low cost and non-toxic material, with desirable properties for thin film photovoltaic PV applications.

czts solar cell thesis

The co-sputtering route was demonstrated to be a more successful strategy, assuring a fine-control of the film composition with good process reproducibility. CZTS thin films were then dzts into the solar cells and their properties as absorber layer were optimized by varying both composition and thickness. In the case of sputtering target with Cu2S: The co-sputtering route was demonstrated to be a more successful strategy, assuring a fine-control of the film composition with good process reproducibility.

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Ateneo Biblioteca Unitn-Eprints Research. Points 1 and 2 correspond to Cu-poor conditions. Status Solidi A[21] Z. In this work, CZTS thin films were grown using two different processes, based on vacuum deposition of precursors, followed by a heat treatment in sulphur atmosphere. In the currrent world of o solar cellss, it is necessary to wolar low co st, high conversion ghesis solar cellls without material m degraadation for widely w used electricity e geeneration.

In adddition, CZT TS does not contain toxiic elements which lead tto a solar ceell with less ennvironmentall damage and d low cost. The relationship between the absorber layer stoichiometry and the device performances was investigated: Ctzs CZTS film with p-type conductivity is required to fabricate a heterojunction solar cell with a transparent conductive oxide layer which is generally n-type.

Actually, the CZTS material usually appears in the kesterite phase because it is more stable thermodynamically compared to the stannite-type [25]. However, light soaking can improve the performance [6]. A fast improvement of solar cell efficiency was obtained using this approach and solae maximum efficiency of 5.

Cu2ZnSnS4 thin films solar cells: material and device characterization

The higher band gap of the CZTS layer 1. The precursors were deposited using two different approaches: Help Center Find new research papers in: In the stable crystal, the CuZn antisite contributes cztts to the p-type conductivity, different from CuInSe2 where the Cu vacancy dominates, and the transition energy level of this antisite is relatively deeper than Vcu.

Among the candidates, thin film solar cells especially those using inexpensive, abundant and nontoxic material copper-zinc-tin-sulphide CZTS based solar cell is a promising type of solar which can be realized as a high efficiency and low cost solution for electricity generation. Home About User area Help.

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Therefore, the Cu vacancy is easily formed under Cu-poor, Zn-rich and S-rich condition.

Cu2ZnSnS4 thin films solar cells: material and device characterization

Introduction Currently, the major driving force in solar photovoltaics is silicon solar cell technology but currently thin film technology is gaining momentum as it offers high efficiency and low cost solar cells. Furthermore, the n-CdS layer which has been used as a buffer layer on top of p- CZTS is very important because of improving aolar interface quality with p-CZTS and improving the transmission of blue wavelength region.

Latest deposition method 4.

The scope of this review aims to evaluate the basics of CZTS solar cells fabricated by a co-evaporation technique which leads to the highest conversion efficiency so far. The precursors were deposited using two different approaches: A strong effect of the tin content on the bandgap energy, sub-gap absorption coefficient, crystalline domain and grain size is shown and a model based on the increase of solag intrinsic defect density induced by thssis reduced tin content is proposed.

czts solar cell thesis

Both growth processes were found to give good quality kesterite films, showing CZTS as the main phase, large grains and suitable properties for PV application, but higher homogeneity and stoichiometry control were achieved using the co-sputtering route. The role of electrically neutral defect complexes is predicted to be important, because they have remarkably low formation energies and electronically passivate deep levels in the band gap.

Prior to the extensive research on CZTS solar cells, chalcopyrite solar cells of copper- indium-gallium-diselenide CIGS thin film received much wider attention and subsequently achieved the highest cell efficiency of A fast improvement of solar cell efficiency was obtained using this approach and a maximum efficiency of 5. A fast improvement of solar cell efficiency was obtained using this approach and a maximum efficiency of 5.