Above 10% Efficiency Earth-abundant Cu2ZnSn(S,Se)4 Solar Cells by Introducing Alkali Metal Fluoride Nanolayers as Electron-selective Contacts
- Citation:
- Cheng-YingChen, Aprillia BS, Wei-ChaoChen, Teng Y-C, Chiu C-Y, Chen R-S, Hwang J-S, Chen K-H, Chen L-C. 2018. Above 10% Efficiency Earth-abundant Cu2ZnSn(S,Se)4 Solar Cells by Introducing Alkali Metal Fluoride Nanolayers as Electron-selective Contacts. Nano Energy. :-.
Abstract:
Abstract The present investigation mainly addresses the open circuit voltage (Voc) issue in kesterites based Cu2ZnSn(S,Se)4 solar cells by simply introducing alkali metal fluoride nanolayers ( several nm NaF, or LiF) to lower the work functions of the front İTO\} contacts without conventional hole-blocking ZnO layers. Kelvin probe measurements confirmed that the work function of the front İTO\} decreases from 4.82 to 3.39 and 3.65 eV for NaF and LiF, respectively, resulting in beneficial band alignment for electron collection and/or hole blocking on top electrodes. Moreover, a 10.4% power conversion efficiency ( 11.5% in the cell effective area) \{CZTSSe\} cell with improved Voc of up to 90 mV has been attained. This demonstration may provide a new direction of further boosting the performance of copper chalcogenide based solar cells as well.
Notes:
n/a
