Coverage up to the infrared region

cocktail perovskite solar cells

Abstract

Printable Pb perovskite solar cells have attracted interest because of a high power conversion efficiency that can reach 17%. However, the light harvesting region has been limited in the visible region to 800 nm. In order to increase the power conversion efficiency further, device structures harvesting energy from the near infrared area are desired. We have succeeded in harvesting light up to 1000 nm by using Sn/Pb cocktail perovskite materials. HOMO-LUMO energy levels were tunable and the stability in air was improved by changing the Sn/Pb ratio. When this was compared to a Pb perovskite solar cell with 14.3% efficiency, the decrease in shunt resistance was remarkable. In order to increase the efficiency further, a design for the charge separation interface that avoids charge recombination is needed.