Patent ID: 11950435
Assignee: ALLIANCE FOR SUSTAINABLE ENERGY, LLC
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A tandem device comprising:
a composite layer having a first bandgap and comprising a first phase comprising ABX3 and a second phase comprising A′2A″B′2 X′7; and
a perovskite layer having a second bandgap, wherein:
A is a first cation, B is a second cation, X is a first anion,
A′ is a third cation, A″ is a fourth cation comprising guanidinium (GA), B′ is a fifth cation, X′ is a second anion,
A′ is different than A″, and
the first bandgap is less than the second bandgap.