CdTe Nanocrystal Hetero-Junction Solar Cells with High Open Circuit Voltage Based on Sb-doped TiO2 Electron Acceptor Materials
Miaozi Li,
Xinyan Liu,
Shiya Wen,
Songwei Liu,
Jingxuan Heng,
Donghuan Qin,
Lintao Hou,
Hongbin Wu,
Wei Xu,
Wenbo Huang
Affiliations
Miaozi Li
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Xinyan Liu
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Shiya Wen
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Songwei Liu
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Jingxuan Heng
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Donghuan Qin
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China
Lintao Hou
Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
Hongbin Wu
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China
Wei Xu
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China
Wenbo Huang
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China
We propose Sb-doped TiO2 as electron acceptor material for depleted CdTe nanocrystal (NC) hetero-junction solar cells. Novel devices with the architecture of FTO/ZnO/Sb:TiO2/CdTe/Au based on CdTe NC and TiO2 precursor are fabricated by rational ambient solution process. By introducing TiO2 with dopant concentration, we are able to tailor the optoelectronic properties of NC solar cells. Our novel devices demonstrate a very high open circuit voltage of 0.74 V, which is the highest Voc reported for any CdTe NC based solar cells. The power conversion efficiency (PCE) of solar cells increases with the increase of Sb-doped content from 1% to 3%, then decreases almost linearly with further increase of Sb content due to the recombination effect. The champion device shows Jsc, Voc, FF, and PCE of 14.65 mA/cm2, 0.70 V, 34.44, and 3.53% respectively, which is prospective for solution processed NC solar cells with high Voc.
