Researchers recognize 13.8% certified effectiveness of kesterite solar cells

• A research study team led by Prof. Meng Qingbo from the Institute of Physics (IOP) of the Chinese Academy of Science (CAS) as well as Prof. Xin Hao from Nanjing University of Posts as well as Telecommunications has actually reported 13.8% accredited effectiveness of emerging kesterite solar cells. The research study was released in Nature Power on April 13.

Kesterite Cu2ZnSn(S, Se)4 (CZTSSe), as one of the most affordable thin-film solar products, exhibits attractive advantages such as earth-abundant elemental reserves, optimum bandgaps for solar (PV) technology, and high stability.

Presently, CZTSSe solar cells reveal power conversion performance (PCE) of 13% based on environmentally friendly solution systems. Nonetheless, big open-circuit voltage deficiency still restricts further enhancement of tool efficiency, largely because of high deep-level defects in CZTSSe absorber.

In this research, the scientists controlled kinetic procedure of CZTSSe phase advancement by managing favorable chamber pressures. Under positive chamber stress, the phase evolution process could be delayed to heat (> 400 ° C). In addition, it would certainly stay clear of complex phase evolution pathways and harmful secondary phases, as well as attain high crystalline CZTSSe absorber with fewer problems. The kesterite solar cell presented 14.1% PCE (overall location) and a qualified 13.8% PCE (overall area), which is the highest possible outcome up until now.

The scientists applied modulate transient photovoltage/photocurrent dimension to examine the provider characteristics process of kesterite solar cells. They found that under a favorable chamber stress, the bulk defects were lowered by around one order of size, and back interface call building was improved too.

This study offers understandings right into the selenization mechanism of kesterite absorbers as well as checks out a new method of kinetic guideline strategy to streamline the phase evolution path to effective kesterite solar cells.