Activation of thin film CdTe solar cells using a cadmium bromide treatment
conference contributionposted on 18.03.2019 by Rachael Greenhalgh, Ali Abbas, Amit Munshi, Tushar M. Shimpi, Kurt L. Barth, Walajabad S. Sampath, Jake Bowers, Michael Walls
Any type of content contributed to an academic conference, such as papers, presentations, lectures or proceedings.
The activation of CdTe with a cadmium chloride annealing treatment is a vital step in the fabrication of high efficiency solar cells. Thin film MZO/CdTe cells have been activated using CdBr2 instead of CdCl2 with a lower activation process temperature. Using this method, CdBr2 does activate the cell as revealed by J-V and EQE measurements. TEM and EDX elemental maps from device cross-sections confirm that bromine is present in the grain boundaries. TEM shows that the treatment removes stacking faults at 425 °C. CdBr2 treatment resulted in a relatively modest conversion efficiency of 5.49% when treated at 375 °C. Nevertheless, the experiments shed further light on the mechanisms involved in the activation.
The Loughborough University authors are grateful to UKERC for financial assistance through the EPSRC Supergen SuperSolar Hub and a studentship with the CDT in New and Sustainable Photovoltaics
- Mechanical, Electrical and Manufacturing Engineering