CdTe thin film solar cells have demonstrated high scalability, high efficiency and low cost fabrication process. One of the key factors for the achievements of this technology is the transformation of the absorber layer by an activation treatment where chlorine reacts with CdTe in a controlled atmosphere or in air, improving the electrical properties of the absorber and enhancing the intermixing of the CdS/CdTe layers. With this work we study the activation process by analyzing the CdCl2 treatment made by wet deposition with different annealing temperatures from 310 °C up to 410 °C in air keeping the same CdCl2 concentration in methanol solution. In this way the whole dynamic of the chemical reaction from the minimum activation energy is analyzed. Activated CdTe layers have been analyzed by means of X-ray diffraction and atomic force microscopy. Finished devices with efficiencies from 8% for the low temperature annealing up to more than 14% for the high temperature ones have been thoroughly analyzed by current–voltage, capacitance–voltage and drive-level capacitance profiling techniques. The best performance has been achieved with an annealing temperature of 395 °C.
CdCl2 activation treatment: A comprehensive study by monitoring the annealing temperature / Xu, Bing Lei; Rimmaudo, Ivan; Salavei, Andrei; Piccinelli, Fabio; Mare, Simone Di; Menossi, Daniele; Bosio, Alessio; Romeo, Nicola; Romeo, Alessandro. - In: THIN SOLID FILMS. - ISSN 0040-6090. - 582:(2015), pp. 110-114. [10.1016/j.tsf.2014.10.006]
CdCl2 activation treatment: A comprehensive study by monitoring the annealing temperature
MENOSSI, Daniele;BOSIO, Alessio;ROMEO, Nicola;
2015-01-01
Abstract
CdTe thin film solar cells have demonstrated high scalability, high efficiency and low cost fabrication process. One of the key factors for the achievements of this technology is the transformation of the absorber layer by an activation treatment where chlorine reacts with CdTe in a controlled atmosphere or in air, improving the electrical properties of the absorber and enhancing the intermixing of the CdS/CdTe layers. With this work we study the activation process by analyzing the CdCl2 treatment made by wet deposition with different annealing temperatures from 310 °C up to 410 °C in air keeping the same CdCl2 concentration in methanol solution. In this way the whole dynamic of the chemical reaction from the minimum activation energy is analyzed. Activated CdTe layers have been analyzed by means of X-ray diffraction and atomic force microscopy. Finished devices with efficiencies from 8% for the low temperature annealing up to more than 14% for the high temperature ones have been thoroughly analyzed by current–voltage, capacitance–voltage and drive-level capacitance profiling techniques. The best performance has been achieved with an annealing temperature of 395 °C.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
