Solar cell comprising neighboring electrically insulating passivation regions having high surface charges of opposing polarities and production method

US8395043B2 · kind B2 · utility

Assignee

• HELMHOLTZ-ZENTRUM BERLIN FÜR MATERIALIEN UND ENERGIE GMBH · DE

Inventors

• Rolf Stangl · Berlin, DE
• Bernd Rech · Bokensdorf, DE

Key dates

• Filing date: Jun 1, 2010
• Grant date: Mar 12, 2013
• Expiry date: Jun 1, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50

Abstract

A solar cell includes a photoactive, semiconductive absorber layer configured to generate excess charge carriers of opposed polarity by light incident on a front of the absorber layer during operation. The absorber layer is configured to separate and move, via at least one electric field formed in the absorber layer, the photogenerated excess charge carriers of opposed polarity over a minimal effective diffusion length Leff,min. The absorber layer has a thickness Lx of 0<Lx≦Leff,min. First contact elements are configured to remove the excess charge carriers of a first polarity on a rear of the absorber layer. Second contact elements are configured remove the excess charge carriers of a second polarity on the rear of the absorber layer. At least one undoped, electrically insulating second passivation region is disposed in an alternating, neighboring arrangement with a first passivation region on the rear of the absorber layer.