Solar cell structures:Reviewing and classifying the various design possibilities

Wrap-up from “cell structures” discussion

Progress meeting 12 April 2013

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

Three main criteria for classification

confidential

Optically efficient

Experimentally feasible

(4 materials)

Electrically efficient

4

Design A Epifree and PECVD today

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si baseEmitter

Substrate

Back-surface fieldContact

c-Si baseEmitter

Substrate

Back-surface field

Contact

5

Design A+Disconti nuous emitt er

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si baseEmitter

Substrate

Back-surface fieldContact

c-Si baseEmitter

Substrate

Back-surface field

Contact

6

Design B.Substrate rear emitt er

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si basePassivation

Substrate

EmitterContact

7

Design C.Superstrate one-side contacts

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si baseEmitter

Back-surface field

8

Design D.Superstrate two-side contacts

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si baseEmitter

Substrate

Back-surface field Transparent Contact

9

Design E. Superstrate NP to Sun

confidential

Optically Electrically

In Epifree In Poly-Si

In PECVD-Si In Epifoils

c-Si basePassivation

Emitter

c-Si basePassivation

Emitter

Transparent contact

nanophotonics for ultra-thin crystalline silicon photovoltaics

project 309127