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A novel CdTe ink-assisted direct synthesis of CdTe thin films for the solution-processed CdTe solar cells
摘要： The CdTe ink in thiol-amine cosolvents from CdTe powder has been successfully prepared via Triton X-100 surfactant at 50 °C. The CdTe thin films have been synthesized and characterized from the prepared CdTe ink using spin coating method. The SEM micrographs reveal that synthesized films are uniform, smooth and homogeneous with less cracks, voids and pinholes compared to the films deposited from the inks without surfactant. The XRD spectra confirm the mixed hexagonal and cubic structure of the deposited films. The Raman peaks at 142 and 122 cm-1 indicate the CdTe and the pure Te phase, respectively. The FTIR peaks at 1638 and 1384 cm-1 due to C=O and COO- groups originated for the stretching vibration of the ligands of the thiol-capped CdTe, and the absence of vibrational peaks of S–H in the range of 2550–2650 cm-1 confirms the thiol-capped CdTe, respectively. The EDX results reveal the existence of Cd and Te elements in CdTe films. The deposited films exhibit the highest absorbance (*85%) with a band gap of 1.5 eV. Hall studies and electrical analysis indicate the high quality of the CdTe films. Therefore, it can be concluded that the developed surfactant-mediated CdTe ink is highly promising for solution-processed CdTe-based photovoltaics.
关键词： spin coating,Triton X-100 surfactant,thiol-amine cosolvents,CdTe ink,CdTe thin films,photovoltaics
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Doping of CdTe using CuCl <sub/>2</sub> Solution for Highly Efficient Photovoltaic Devices
摘要： Here, we report doping of cadmium telluride (CdTe) thin film solar cells using copper (II) chloride (CuCl2) solution in deionized water. The CdTe thin films were immersed in 0.1 mmol CuCl2 solution in water and annealed in the temperature range of 180 – 240 ℃ for various time durations. The devices were completed using thermally evaporated gold (Au) and measured under simulated AM1.5G spectrum. The average device efficiency of CuCl2 treated CdTe devices increased to 13.7 % (best cell reaching 14.0%) with significant improvement on open-circuit voltage (VOC) as compared with 12.4% (best cell 12.7%) for thermally evaporated Cu doped CdTe devices. For CuCl2 treated CdTe devices, we found higher photoluminescence (PL) intensity and longer carrier life time at room temperature indicating solution based doping offers better control of Cu doping density as compared with evaporated Cu.
关键词： doping,CdTe,thin films,CuCl2,solar cells
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - CdCl <sub/>2</sub> Activation of the ZnTe:As Back Contact Layer in CdTe Thin Film Solar Cells, Employing a CdS Sacrificial Layer
摘要： Incorporating ZnTe:As back contact to CdTe thin film solar cells is an attractive alternative to Cu treated ZnTe back contacts, getting rid of Cu diffusion and subsequent long term stability issues. However, the Zn loss by the formation of volatile ZnCl2 during CdCl2 deposition heat treatment for the back-contact activation remains a challenge. The aim of this work is to develop an effective activation process for ZnTe:As back contacts, which is expected to improve CdTe solar cell efficiencies. To minimize Zn loss, a thin CdS sacrificial cap layer was evaluated which was deposited on ZnTe:As via MOCVD prior to the contact layer activation step.
关键词： ZnTe back contact,photovoltaic cells,CdS sacrificial layer,CdTe,Thin films
更新于2025-09-19 17:13:59