PO<sub>4</sub><sup>3−</sup> Tetrahedron Assisted Chelate Engineering for 10.67%‐Efficient Antimony Selenosulfide Solar Cells
Donglou Ren, Boyang Fu, Jun Xiong, Yi Wang, Bin Zhu, Shuo Chen, Zhiqiang Li, Hongli Ma, Xianghua Zhang, Daocheng Pan, Bingsuo Zou, Guangxing Liang
Abstract
Abstract Anisotropic carrier transport and deep‐level defect of antimony selenosulfide (Sb 2 (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 Sb 2 (S,Se) 3 film based on hydrothermal deposition approach, which realizes desirable carrier transport and passivated defects by using tetrahedral PO 4 3− ion in dibasic sodium phosphate (Na 2 HPO 4 , DSP). The PO 4 3− Lewis structure, on one hand in the form of [(SbO) 3 (PO 4 )] chelate, can adsorb on the polar planes of cadmium sulfide (CdS) layer, promoting the heterogeneous nucleation, and on the other hand, the tetrahedral PO 4 3− inhibits horizontal growth of (Sb 4 S(e) 6 ) n ribbons due to size effects, thus achieving desirable [hk1] orientation. Moreover, the introduction PO 4 3− effectively passivates the antisite defect Sb S1 . These synergistic effects have effectively improved carrier transport and reduced non‐radiative recombination of the Sb 2 (S,Se) 3 absorber. Consequently, the DSP‐modified Sb 2 (S,Se) 3 device efficiency increases from 8.59% to 10.67%.