Patent ID: 9425420
Filing Date: 2016-08-23
CPC Classification: C08G,H01L,Y02E

Claim Text:
1. An inverted tandem polymer photovoltaic device, comprising: a hole-extracting electrode; an electron extracting electrode spaced apart from said hole-extracting electrode; a first bulk hetero-junction polymer semiconductor layer; a second bulk hetero-junction polymer semiconductor layer spaced apart from said first bulk hetero-junction polymer semiconductor layer; and between said first and second bulk hetero-junction polymer semiconductor layers, a p-type layer in physical contact with one of the first and second bulk hetero-junction polymer semicondutor layers, and an n-type layer in physical contact with the other of the first and second bulk hetero-junction polymer semiconductor layer; wherein at least one of the p-type layer and the n-type layer is doped to an extent that charge carriers tunnel through the p-type and/or n-type layer, and wherein one polymer used in either the first or second bulk hetero-junction polymer semiconductor layers has a structure of formula (I) wherein R X is selected from oxygen, sulfur, selenium and nitrogen atoms; and Ar