PO4 3- Tetrahedron Assisted Chelate Engineering for 10.67%-Efficient Antimony Selenosulfide Solar Cells
Donglou Ren1, Boyang Fu1, Jun Xiong1
1State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
Abstract:
Anisotropic carrier transport and deep-level defect of antimony selenosulfide (Sb2(S,Se)3) absorber are two vital auses restraining the photovoltaic performance of this emerging thin-film solar cell. Herein, chelate engineering is proposed to prepare high-quality Sb2(S,Se)3 film based on hydrothermal deposition approach, which realizes desirable carrier transport and passivated defects by using tetrahedral PO4 3- ion in dibasic sodium phosphate (Na2HPO4, DSP). The PO4 3- Lewis structure, on one hand in the form of [(SbO)3(PO4)] chelate, can adsorb on the polar planes of cadmium sulfide (CdS) layer, promoting the heterogeneous nucleation, and on the other hand, the tetrahedral PO4 3- inhibits horizontal growth of (Sb4S(e)6)n ribbons due to size effects, thus achieving desirable [hk1] orientation. Moreover, the introduction PO4 3- effectively passivates the antisite defect SbS1. These synergistic effects have effectively improved carrier transport and reduced non-radiative recombination of the Sb2(S,Se)3 absorber. Consequently, the DSP-modified Sb2(S,Se)3 device efficiency increases from 8.59% to 10.67%.
Related Concept Videos
02:26Preparation and Reactions of Sulfides
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...