Incorporation of Mn2+ into CdSe quantum dots by chemical bath co-deposition method for photovoltaic enhancement of quantum dot-sensitized solar cells.
Chenguang ZhangShaowen LiuXingwei LiuFei DengYan XiongFang-Chang TsaiPublished in: Royal Society open science (2018)
A photoelectric conversion efficiency (PCE) of 4.9% was obtained under 100 mW cm-2 illumination by quantum-dot-sensitized solar cells (QDSSCs) using a CdS/Mn : CdSe sensitizer. CdS quantum dots (QDs) were deposited on a TiO2 mesoporous oxide film by successive ionic layer absorption and reaction. Mn2+ doping into CdSe QDs is an innovative and simple method-chemical bath co-deposition, that is, mixing the Mn ion source with CdSe precursor solution for Mn : CdSe QD deposition. Compared with the CdS/CdSe sensitizer without Mn2+ incorporation, the PCE was increased from 3.4% to 4.9%. The effects of Mn2+ doping on the chemical, physical and photovoltaic properties of the QDSSCs were investigated by energy dispersive spectrometry, absorption spectroscopy, photocurrent density-voltage characteristics and electrochemical impedance spectroscopy. Mn-doped CdSe QDs in QDSSCs can obtain superior light absorption, faster electron transport and slower charge recombination than CdSe QDs.
Keyphrases
- quantum dots
- solar cells
- transition metal
- room temperature
- sensitive detection
- metal organic framework
- ionic liquid
- energy transfer
- high resolution
- dna damage
- magnetic resonance imaging
- gold nanoparticles
- solid state
- single molecule
- gas chromatography mass spectrometry
- dna repair
- highly efficient
- reduced graphene oxide
- tandem mass spectrometry
- molecularly imprinted