Researchers achieve 24.5% conversion efficiency of large area all perovskite tandem solar cells

Researchers from Nanjing University, University of Victoria and Australian National University have achieved a high conversion efficiency of 24.5% on large-size all-perovskite tandem solar cells. The result, which the team states is a new world record for the efficiency of all-perovskite tandem solar cells, has reporetdly been confirmed by an international third-party testing institute.

When a lead-tin perovskite is used instead of silicon as the narrow band gap cell in all-perovskite tandem solar cells, the result is often low film quality and device efficiency due to nonuniform nucleation and fast crystallization. In this recent work, the team shows that aminoacetamide hydrochloride can strongly coordinate the precursor components in solution, which homogenizes the crystallization process and also passivates the buried perovskite interface. The authors achieved a certified power conversion efficiency of 24.5% for a 20-square-centimeter module made by blade-coating the layers. 


The team used the aminoacetamide hydrochloride dopant to homogenize perovskite crystallization and to extend the processing window for blade-coating Pb-Sn perovskite films, as well as selectively passivate defects at the buried perovskite interface. 

The resulting all-perovskite tandem solar module exhibited a certified power conversion efficiency of 24.5% with an aperture area of 20.25 square centimeteIn 

In October 2022, Chinese perovskite solar technology company Renshine Solar (Suzhou), founded by Nanjing University’s Professor Tan Hairen (also an author of this recent work), announced achieving steady-state efficiency of 24.50% for all-perovskite tandem cell module

Posted: Feb 28,2024 by Roni Peleg