Download or read book Electronic Transport and Potential Barriers at the MoSe2 Mo Back Contact in Cu In Ga Se2 Solar Cells written by Nils Neugebohrn and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the MoSe2-Mo back contact of Cu(In,Ga)Se2 solar cells was investigated and its impact for CIGSe solar cells was assessed. An investigation of a MoSe2/Mo samples, in which Mo layers with varied sodium supply were selenized, revealed, that the sodium mainly diffuses to the sample surface and MoSe2/Mo interface. While an inverse relation between sodium supply and the thickness of the MoSe2 layer was found, the sodium content had hardly an impact on the resistivity of the MoSe2 layers. To investigate the presence of a barrier at the back contact, a study of samples with isolated back contact structures was realized. By the means of IVT measurements, a barrier was found to be present at the CIGSe/MoSe2 interface, while the MoSe2/Mo interface could be classified to be ohmic. Based on all the experimental previous results, a simulation model of the CIGSe solar cell was set up to enable a comprehensive understanding of the impact of the back contact on the solar cell characteristics. engl.

Download or read book New Deposition Process of Cu In Ga Se2 Thin Films for Solar Cell Applications written by Himal Khatri and published by . This book was released on 2009 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molybdenum (Mo) is currently the most common material used for Cu(In, Ga)Se2 solar cell back contacts. The first objective of this study is to utilize in-situ and ex-situ characterization techniques to investigate the growth, as well as the physical and chemical properties, of Mo thin films deposited by RF magnetron sputtering onto soda-lime glass (SLG) substrates. The effects of the deposition pressure on the nucleation and growth mechanisms that ultimately influence morphology and grain structure have been studied. Correspondence between real time spectroscopic ellipsometry (RTSE), X-ray diffraction (XRD), atomic force microscopy (AFM), and four-point probe resistivity measurements indicate that increasing deposition pressure leads to smaller average grain sizes and higher oxygen content in the Mo thin films. Changes of the material properties were also evaluated by changing RF power. It is observed that higher RF power, results in higher conductivity films. The second and overall objective of this work is to focus on the deposition and characterization of the Cu(In, Ga)Se2 absorber layer using the hybrid co-sputtering and evaporation process, which has potential for commercial PV. Solar cells were completed with a range of elemental compositions in the absorber layer, keeping a constant profile of Ga and varying Cu concentrations. The slightly Cu deficient Cu(In, Ga)Se2 films of band gap ~1.15 eV fabricated by this process consist of a single chalcopyrite phase and device efficiencies up to 12.4% were achieved for the composition ratios (x, y) = (0.30, 0.88). Correspondence between energy dispersive X-ray spectroscopy (EDS), X-ray diffraction, transmission and reflection (T & R), four-point probe resistivity, and current density-voltage (J-V) measurements indicate that increased Cu concentration leads to the incorporation of a secondary phase Cu2-xSe compound in the Cu(In, Ga)Se2 films, which is detrimental to cell performance. The third objective of this work is to evaluate the Cu2-xSe material properties by employing in-situ RTSE, as well as ex-situ SE and various other characterization techniques. SE revealed that the dielectric function spectra of Cu2-xSe evolve with temperature, providing insights into the evolution of transport properties and critical point structures. At room temperature, semi-metallic behavior of Cu2-xSe thin films was revealed by SE and Hall Effect measurements. These characteristics serve as key inputs for optical modeling of complex layer structures of Cu(In, Ga)Se2 films grown by 2- and 3-step processes.

Download or read book Electronic Transport and Doping Mechanisms in Cu In Ga Se2 Thin Film Solar Cells written by Fabian Hans Pianezzi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Integration of Highly Reflective Back Contacts in Microstructured Cu In Ga Se2 Solar Cells written by Thomas Schneider and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the introduction of a highly-reflective back contact in Cu(In,Ga)Se2 (CIGSe) based solar cells. Such a back contact can be used to compensate for the optical losses, which correspond with such a reduction. Such a reduction would enable a cost reduction of this solar cell type. It was demonstrated that an Al/ITO-based back contact has compared to the regularly used Mo-back contact a considerably increased reflection. Interestingly, the investigated back contact is also compatible with process temperatures as high as 600°C. The described back contact was also combined with a nanostructured substrate. Finally, the measured data was furthermore used to obtain general insights into the admittance spectroscopy of CIGSe solar cells.

Download or read book Nanoscale investigation of potential distribution in operating Cu In Ga Se2 thin film solar cells written by Zhenhao Zhang and published by KIT Scientific Publishing. This book was released on 2014-10-16 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of the electrostatic potential in and between the materials in Cu(In,Ga)Se2 thin-film solar cells has a major impact on their superior performance. This thesis reported on the nanoscale imaging of the electrostatic potential on untreated cross sections of operating Cu(In,Ga)Se2 solar cells using Kelvin probe force microscopy.

Download or read book Relation de Zwischen Den Chur Bayrischen dann den Kays vnnd Fr nckischen Cray Trouppen zu Emhoffen an der Vil vnweit Schmidtm hl in dem Pfaltz Neuburgischen vorgangnen Rencontre written by and published by . This book was released on 1703 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimisation of Cu In Ga Se 1tn2 Thin Film Solar Cells and Modules for Low Irradiance Conditions written by Alessandro Virtuani and published by . This book was released on 2004 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Properties of the Back Contact Interface for Non Vacuum Deposited Precursor Based Cu In Ga Se2 Solar Cells written by Annegret Veronika Haug and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Charge Carrier Transport in Cu In Ga Se2 Thin film Solar cells Studied by Electron Beam Induced Current and Temperature and Illumination Dependent Current Voltage Analyses written by Melanie Nichterwitz and published by . This book was released on 2012 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evolution of Electronic Properties of Cu In Ga Se2 CIGS based Solar Cells During a 3 stage Growth Process written by Jehad A. AbuShama and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ZrN Back Contact Reflectors and Ga Gradients in Cu In Ga Se2 Solar Cells written by Sebastian Michael Schleussner and published by . This book was released on 2011 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Modified Deposition Process for Cu In Ga Se2 Solar Cell Back Contact written by Tasnuva Ashrafee and published by . This book was released on 2017 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Microstructural and Chemical Features in Cu In Ga Se S based Thin film Solar Cells written by Ankush R. Halbe and published by . This book was released on 2006 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: For a sample with a transparent back contact, a 10 nm Mo layer was deposited on ITO (indium tin oxide) before deposition of the CIGS2 (Cu(In,Ga)S2) layer. EFTEM maps indicate that a MoS2 layer does not form for such a Mo/MoS2-ITO back contact. Instead, absorber layer material diffuses through the thin Mo layer onto the ITO forming two layers of CIGS2 on either side of Mo with different compositions.

Download or read book Optimization of Top Contact for Cu In Ga Se2 Solar Cells written by Grace Cherukara Rajan and published by . This book was released on 2018 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Anticipated Performance of Cu In Ga Se2 Solar Cells in the Thin film Limit written by Ana Kanevce and published by . This book was released on 2007 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterisation of Cu In Ga Se2 Thin Films for Solar Cell Applications written by E. Ahmed and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flexible Cu In Ga Se2 Based Solar Cells Using Molybdenum Foils as Substrate written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : The figure shows a completed CIGS cell that was successfully made on a flexible Mo foil. Adequate fine‐tuning led to an efficiency of 14% on this cell. This paper (Mishael Stanley, et al., article number1700174, in this issue) investigates the performance of CIGS cells made on flexible Mo substrates. The use of an Mo foil discards the need for an extra layer of Mo deposited by sputtering.