title: Effective performance for undoped and boron-doped double-layered nanoparticles-copper telluride and manganese telluride on tungsten oxide photoelectrodes for solar cell devices.
abstract: This work demonstrates the synthesis of a novel double-layered Cu2-xTe/MnTe structure on a WO3 photoelectrode as a solar absorber for photovoltaic devices. Each material absorber is synthesized using a successive ionic layer adsorption and reaction (SILAR) method. The synthesized individual particle sizes are Cu2-xTe(17) ∼5-10nm and MnTe(3) ∼2nm, whereas, the aggregated particle sizes of undoped and boron-doped Cu2-xTe(17)/MnTe(11) are ∼50 and 150nm, respectively. The larger size after doping is due to the interconnecting of nanoparticles as a network-like structure. A new alignment of the energy band is constructed after boron/MnTe(11) is coated on boron/Cu2-xTe nanoparticles (NPs), leading to a narrower Eg equal to 0.58eV. Then, the valence band maximum (VBM) and conduction band minimum (CBM) with a trap state are also up-shifted to near the CBM of WO3, leading to the shift of a Fermi level for ease of electron injection. The best efficiency of 1.41% was yielded for the WO3/boron-doped [Cu2-xTe(17)/MnTe(11)] structure with a photocurrent density (Jsc)=16.43mA/cm(2), an open-circuit voltage (Voc)=0.305V and a fill factor (FF)=28.1%. This work demonstrates the feasibility of this double-layered structure with doping material as a solar absorber material.
authors.affiliation: Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand. Electronic address: pornpimol.srathongluan@gmail.com.
authors.forename: Pornpimol
authors.initials: P
authors.lastname: Srathongluan
authors.affiliation: Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand. Electronic address: veeramol.v@ku.ac.th.
authors.forename: Veeramol
authors.initials: V
authors.lastname: Vailikhit
authors.affiliation: Department of Physics, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand. Electronic address: ktpichan@kmitl.ac.th.
authors.forename: Pichanan
authors.initials: P
authors.lastname: Teesetsopon
authors.affiliation: Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Thailand Center of Excellence in Physics (ThEP Center), CHE, Bangkok 10400, Thailand. Electronic address: supab99@gmail.com.
authors.forename: Supab
authors.initials: S
authors.lastname: Choopun
authors.affiliation: Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand. Electronic address: tubtimtae@gmail.com.
authors.forename: Auttasit
authors.initials: A
authors.lastname: Tubtimtae
keywords: Boron doping; Copper telluride; Double-layered structure; Manganese telluride; Solar cells