Patent ID: 7157641
Filing Date: 2007-01-02
Classification: H01L,Y02E,Y02P,Y10S

Abstract:
1. A method for fabricating a bi-layer photovoltaic cell, comprising: mixing a plurality of p-type nanocrystalline semiconductors in a first binder matrix; forming a thin p-layer comprising the mixed p-type nanocrystalline semiconductors and the first binder matrix; mixing a plurality of n-type nanocrystalline semiconductors in a second binder matrix; forming a thin n-layer comprising the mixed n-type nanocrystalline semiconductors and the second binder matrix; and binding the p-layer and the n-layer to establish contact between at least a portion of the n-type nanocrystalline semiconductors and the p-type nanocrystalline semiconductors at a p-n heterojunction interface, wherein the p-type mixing further comprises mixing in a plurality of anion additives and wherein the n-type mixing further comprises mixing in a plurality of cation additives, whereby during the binding uncompensated anions are produced proximal to the interface in the p-layer and uncompensated cations are produced proximal to the interface in the n-layer, and wherein an electric field is formed integrally at the interface rather than uniformly across the cell.