Patent ID: 9252313
Filing Date: 2016-02-02
CPC Classification: H01L,Y02E

Claim Text:
1. A solar cell comprising: a first cell formed of GaInP, the first cell absorbing a first portion of incident light to thereby generate a first current; a second cell formed of GaInAs, the second cell arranged below the first cell in a direction of the incident light, the second cell absorbing a second portion of the incident light to thereby generate a second current, the second cell having a thickness between 800 nm to 2000 nm; a semiconductor mirror arranged below the second cell in the direction of incident light, the semiconductor mirror reflecting a non-absorbed portion of the second portion of light back towards the second cell thereby the absorption of the second portion of the incident light is increased in the second cell, the semiconductor mirror comprising a plurality of layers, each of the plurality of layers having a thickness between 10 nm and 150 nm, a half width value of reflection of the semiconductor mirror being in a range between 50 nm to 300 nm; and a third cell formed of Ge, the third cell arranged below the semiconductor mirror, the third cell absorbing a third portion of the incident light to thereby generate a third current.