TY - JOUR T1 - Generalized quantum efficiency analysis for non-ideal solar cells: Case of Cu 2 ZnSnSe 4 JF - Journal of Applied Physics Y1 - 2016 A1 - Charles J. Hages A1 - Carter, Nathaniel J. A1 - Rakesh Agrawal VL - 119 UR - http://aip.scitation.org/doi/10.1063/1.4939487http://aip.scitation.org/doi/pdf/10.1063/1.4939487 CP - 1 J1 - Journal of Applied Physics KW - Hages2016 ER - TY - JOUR T1 - Optoelectronic and material properties of nanocrystal-based \{CZTSe\} absorbers with Ag-alloying JF - Solar Energy Materials and Solar Cells Y1 - 2016 A1 - Charles J. Hages A1 - Mark J. Koeper A1 - Rakesh Agrawal KW - Characterization AB - Abstract In this work, the benefits of Ag-alloying in kesterite solar cells are explored in terms of tunable band gap, improved grain growth, improved minority carrier lifetime, reduced defect formation, and reduced potential fluctuations for (Ag,Cu)2ZnSnSe4 (ACZTSe) absorbers relative to Cu2ZnSnSe4 (CZTSe). The enhanced optoelectronic properties are shown to scale here with the degree of Ag-alloying in ACZTSe. The impacts of these effects on device performance are discussed, with improvement in average device performance/open-circuit voltage reported for \{ACZTSe\} (5%-Ag) absorbers relative to \{CZTSe\} absorbers with similar band gap. These initial results are promising for the Ag-alloyed \{ACZTSe\} material system as \{VOC\} limitations are the primary cause of poor device performance in kesterite solar cells, and cation substitution presents a unique method to tune the defect properties of kesterite absorbers. Herein, nanoparticle synthesis and large-grain \{ACZTSe\} absorber formation is described followed by material and optoelectronic characterization. Additionally, \{RTP\} processing is presented to achieve fully selenized large-grain chalcogenide absorbers from sulfide nanocrystal inks. VL - 145, Part 3 UR - http://www.sciencedirect.com/science/article/pii/S0927024815005504 KW - Hages2016opto ER -