Patent ID: 9530911
Filing Date: 2016-12-27
CPC Classification: H01L,Y02E

Claim Text:
1. An optoelectronic device comprising a photovoltaic cell, the photovoltaic cell comprising: a space-charge region; a quasi-neutral region; and a low bandgap absorber region (LBAR) layer or an improved transport (IT) layer at least partially positioned in the quasi-neutral region of the cell, wherein the LBAR layer or the IT layer forms a first portion of a base layer of the cell and the cell further comprises: a window layer; a back-surface-field (BSF) layer; an emitter layer; a second portion of the base layer; and a third portion of the base layer, wherein the first portion of the base layer is disposed between the second portion of the base layer and the third portion of the base layer, the second portion of the base layer is adjacent the emitter layer, the third portion of the base layer is disposed between the first portion of the base layer and the BSF layer, and the first portion of the base layer is positioned entirely in the quasi-neutral region of the base layer, entirely in the space-charge region, or partly in the quasi-neutral region and partly in the space-charge region, wherein the first portion of the base layer has a lower aluminum mole percent and lower bandgap than the second and third portions of the base layer.