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Tailoring Cu2xTe quantum-dot-decorated ZnO nanoparticles for potential solar cell applications
Auttasit Tubtimtae,Surachet Phadungdhitidhada,Duangmanee Wongratanaphisan,Atcharawon Gardchareon,Supab Choopun 한국물리학회 2014 Current Applied Physics Vol.14 No.5
Cu2xTe QDs on ZnO nanoparticles were synthesized using a successive ionic layer absorption and reaction technique (SILAR) at room temperature. The as-synthesized QDs which were distributively deposited on ZnO nanoparticles surface were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction and high-resolution transmittance microscope (HR-TEM). It revealed that the average diameter of the QDs was w2 nm. The synthesized Cu2xTe QDs were solely orthorhombic Cu1.44Te phase. The growth mechanism was supposed that it based on ions deposition. The energy gap of as-synthesized Cu2xTe QDs was determined w1.1 eV and the smallest energy gap of 0.76 eV was obtained, equal to that of bulk material. Raman spectroscopy and FTIR were also used to study the Cu2xTe QDs on ZnO nanoparticles. These characteristics suggest a promising implication for a potential broadband sensitizer of QDSCs.
Sutthipoj Sutthana,Kritsada Hongsith,Pipat Ruankham,Duangmanee Wongratanaphisan,Atcharawon Gardchareon,Surachet Phadungdhitidhada,Dheerawan Boonyawan,Pisist Kumnorkaew,Adisorn Tuantranont,Supab Choopu 한국물리학회 2017 Current Applied Physics Vol.17 No.4
An interfacial modification of CH3NH3PbI3/PCBM is investigated by pre-heating PCBM solution before spin-coating on the CH3NH3PbI3layer.By adjusting PCBM concentration, PCBM films were optimized to form homogeneous films. Besides, the pre-heat treatment of PCBM solution exhibits a better covered area over CH3NH3PbI3 layer with reduced pinhole compared with the non-heat treatment. This can be explained by the higher thermal energy PCBM molecules of the pre-heat solution leading to higher molecule mobility that can reorganizes a structural as well as enhance the diffusion and enhance coverage of PCBM films over CH3NH3PbI3. The optimized cell is enhanced with average power conversion efficiency from 4.59% up to 5.76% (6.44% maximum) by heat treatment. To investigate interface between CH3NH3PbI3 and PCBM, the contact angle was measured and found that the contact angle of PCBM films were higher after heat treatment suggesting re-alignment and better orientation of PCBM on perovskite film. The better orientation of PCBM can be explained in term of hydrophilic/hydrophobic property of the interface between CH3NH3PbI3 and PCBM. These results suggest that pre-heat treatment of PCBM solution has ability to modify the interface for better orientation of PCBM and resulting in efficiency enhancement due to better carrier transport direction at the CH3NH3PbI3/PCBM interfaces for perovskite solar cells. In addition, the better orientation that the head (non-polar)is oriented at outer surface can also prevent the solar cells from surrounding moisture.