1. School of Engineering University of Warwick Coventry CV4 7AL UK
2. Fraunhofer Institute for Solar Energy Systems ISE Heidenhofstraße 2 79110 Freiburg Germany
3. Institute for Sustainable Systems Engineering University of Freiburg Emmy‐Noether‐Straße 2 79110 Freiburg Germany
4. Warwick Manufacturing Group University of Warwick Coventry CV4 7AL UK
5. Department of Materials University of Oxford Parks Road Oxford OX1 3PH UK
6. Department of Physics University of Warwick Coventry CV4 7AL UK