Kesterite Thin‐Film Solar Cell: Role of Grain Boundaries and Defects in Copper–Zinc–Tin–Sulfide and Copper–Zinc–Tin–Selenide
L. Sravani, Soumyaranjan Routray, K P Pradhan, Maykel Courel
Abstract
Kesterite materials, such as copper–zinc–tin–sulfide (CZTS) solar cell, have received considerable attention for low‐cost and high‐efficiency solar cells. However, the material suffers from poor quality of thin film during deposition, which, in turn, creates multiple grain boundaries along the layer. Consequently, a higher density of defects is randomly formed throughout the layer. Herein, the impact of different loss mechanisms on solar cell performance is analyzed. Numerical investigation on the influence of different loss mechanisms such as radiative recombination and recombination through traps and defects on the performance of the device is presented. A remarkable efficiency decrement of 10% in the devices is found due to the presence of defects and grain boundaries.