Novel Hybrid Ligands for Passivating PbS Colloidal Quantum Dots to Enhance the Performance of Solar Cells

Yuehua Yang; Baofeng Zhao; Yuping Gao; Han Liu; Yiyao Tian; Donghuan Qin; Hongbin Wu; Wenbo Huang; Lintao Hou

doi:10.1007/s40820-015-0046-4

Novel Hybrid Ligands for Passivating PbS Colloidal Quantum Dots to Enhance the Performance of Solar Cells

Nanomicro Lett. 2015;7(4):325-331. doi: 10.1007/s40820-015-0046-4. Epub 2015 Jun 20.

Authors

Yuehua Yang¹, Baofeng Zhao¹, Yuping Gao¹, Han Liu¹, Yiyao Tian¹, Donghuan Qin¹, Hongbin Wu¹, Wenbo Huang¹, Lintao Hou²

Affiliations

¹ 1State Key Laboratory of Luminescent Materials & Devices, Institute of Polymer Optoelectronic Materials & Devices, South China University of Technology, Guangzhou, 510640 People's Republic of China.
² 2Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou, 510632 People's Republic of China.

Abstract

We developed novel hybrid ligands to passivate PbS colloidal quantum dots (CQDs), and two kinds of solar cells based on as-synthesized CQDs were fabricated to verify the passivation effects of the ligands. It was found that the ligands strongly affected the optical and electrical properties of CQDs, and the performances of solar cells were enhanced strongly. The optimized hybrid ligands, oleic amine/octyl-phosphine acid/CdCl₂ improved power conversion efficiency (PCE) to much higher of 3.72 % for Schottky diode cell and 5.04 % for p-n junction cell. These results may be beneficial to design passivation strategy for low-cost and high-performance CQDs solar cells.

Keywords: Colloidal quantum dot; Ligands; PbS; Solar cells.