Acknowledgments

1. MB Schubert, JH Werner, Flexible solar cells for clothing, Materials today 9 (6), 42-50.

2. MB Schubert, R Merz, Flexible solar cells and modules, Philosophical Magazine 89 (28-30), 2623-2644.

3. U RAU, Closed-form expression for the current/voltage characteristics of pin solar cells , Appl. Phys. A 86, 151.