1. Solar cell structures: Reviewing and classifying the various design possibilities Wrap-up from “cell structures” discussion Progress meeting 12 April 2013

2. 2 Main questions behind each design confidential 1. Emitter: front side or rear side? 2. Emitter: continuous or discontinuous? 3. Nanopattern: sunny side or shadow side? 4. Contacts: Two-side or one-side?

3. 3 Three main criteria for classification confidential Optically efficient Experimentally feasible (4 materials) Electrically efficient

4. 4 Design A Epifree and PECVD today confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Emitter Substrate Back-surface field Contact c-Si base Emitter Substrate Back-surface field Contact

5. 5 Design A+ Discontinuous emitter confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Emitter Substrate Back-surface field Contact c-Si base Emitter Substrate Back-surface field Contact

6. 6 Design B. Substrate rear emitter confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Passivation Substrate Emitter Contact

7. 7 Design C. Superstrate one-side contacts confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Emitter Back-surface field

8. 8 Design D. Superstrate two-side contacts confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Emitter Substrate Back-surface field Transparent Contact

9. 9 Design E. Superstrate NP to Sun confidential OpticallyElectrically In EpifreeIn Poly-Si In PECVD- Si In Epifoils c-Si base Passivation Emitter c-Si base Passivation Emitter Transparent contact

10. nanophotonics for ultra-thin crystalline silicon photovoltaics project 309127