PbS quantum dot sensitized anatase TiO2 nanocorals for quantum dot-sensitized solar cell applications

Abstract

Lead sulphide (PbS) quantum dot (QD) sensitized anatase TiO(2) nanocorals (TNC) were synthesized by SILAR and hydrothermal techniques. The TNC, PbS and PbS-TNC samples were characterized by optical absorption, XRD, FT-IR, FESEM and XPS. The results show that PbS QDs are coated on the TNCs, the optical absorption is found to be enhanced and the band edge is shifted to ~693 nm as compared with plain TNCs at 340 nm. The PbS-TNC sample exhibits an improved photoelectrochemical performance with a maximum short circuit current (J(sc)) of 3.84 mA cm(-2). The photocurrent density was found to be enhanced 2 fold, as compared with those of the bare PbS photoelectrode. The total power conversion efficiency of the PbS-TNC electrodes is 1.23%.

Synthesis, characterization and photoelectrochemical properties of PbS sensitized vertically aligned ZnO nanorods: modified aqueous route

“…3j, k). Such well aligned coated microstructures are highly beneficial for solar cell application [5,22].…”

“…4a). The presence of C is from atmospheric contamination during transfer of film and initially used organic precursors [22]. As well obtained binding energies from the XPS analysis were corrected to the taking into account specimen charge by referencing C1s at 285.02 eV [5].…”

“…PbS) is achieved large researchers interest due to their unique properties such as, high absorption coefficient [17], long exciton lifetime, band gap tunability through quantum confinement [18,19]. Various PbS thin films were synthesized using solvothermal [20], cyclic microwave synthesis [21], SILAR [22] and colloidal synthesis route [23], etc. Among aforesaid techniques; SILAR is a highly suitable technique for sensitization purpose.…”

The Reduced Recombination and the Enhanced Lifetime of Excited Electron in QDSSCs Based on Different ZnS and SiO2Passivation

“…The QDs were used in QDSSCs as sensitizers which include PbS [4,5], PbSeS [6], CdS [7], CdSe [8], CdTe [9], and ZnS [10]. The highest efficiency, which was achieved by Jara et al, was approximately 2.51% for CuInS 2 [11] because the electrons in the CB of the QDs moved to the electrolyte and recombined or got blocked.…”

Synthesis and photoelectrical performance of nanoscale PbS and Bi2S3 co-sensitized on TiO2 nanotube arrays

“…Moreover, their band gaps can be conveniently tailored by controlling the size of nanoparticles [4]. PbS [5], Bi 2 S 3 [6], and other inorganic semiconductors have been used to sensitize n-type wide-band gap semiconductor, such as TiO 2 . TiO 2 nanotube arrays (TiO 2 NAs) are attracting considerable interest, because they can provide direct and efficient transport channels for photogenerated electrons, and promote the separation of photogenerated electrons and holes [7].…”