Session Index

Metal halide perovskites (MHPs) are promising materials for photoactive layers in solar cells (SCs) because they have outstanding advantages such as low exciton binding energy (29-50 meV for CH3NH3PbI3) and high carrier mobility (≤100 cm2/V∙s). Even though many researches on the MHP layer have been done so far, significance of interfacial layers has often been overlooked. Tailoring the interfacial energetics between an electrode and a photoactive layer in MHPs based SCs is important to maximize open circuit voltage (Voc) and thereby power conversion efficiency (PCE). Although PEDOT:PSS is the most widely used hole extraction layer (HEL), it cannot make Ohmic contact with overlying organic or perovskite photoactive layer due to its low work function (WF) of ~5.0 eV leading to decrease in Voc and thereby PCE (PCDTBT and MAPbI3 ~5.4 eV). To overcome the problem, we used a conducting polymer (CP) blend which has an increasing gradient WF from bottom to top owing to the gradient concentration of perfluorinated ionomer (PFI) in the film. Use of the CP with high WF successfully increased Voc and thereby PCE of perovskite SCs by minimizing energy offset with the photoactive layers. Also, we present MHP nanoparticles (NPs) synthesized by ligand-engineering method to make SCs with high reproducibility. MHP polycrystalline (PC) bulk film based SCs had low reproducibility due to poor surface morphology of MHP PC films. Furthermore, controlling the surface morphology of MHP PC films is very difficult because the environmental conditions such as temperature and moisture have a strong influence on the morphology. Ligand engineering methods which reduce the alkyl length of ligand improved the charge extraction/transport characteristics in MHP NP films. Our research suggests a promising way to increase the PCE in perovskite NP SCs.

 

Performance of Perovskite Solar Cells highly is influenced by electron transport layer. In this work, electron transport layer (TiO2) was doped by Zn. Impedance spectroscopy was used to study this material. It shows that Zn doped TiO2 has higher charge transport and lower recombination rate than pristine TiO2.

 

High efficiency and stable bifacial-transparent perovskite cells are achieved by using an ITO/MoOx bilayer as the anode electrode with a cyclopenta[2,1-b;3,4-b’]dithiophene (CT) based HTM, which allows bifacial illumination from both sides of the electrodes. The highest PCE for the solar cells and modules are 16.38% and 14.96%, respectively.

 

We investigated the effects of the parameters of the circular planar solar concentrator on its performance and optimized them for attaining higher efficiency, concentration ratio, and wider acceptance angle. The simulation results indicate the optimal model provides the 82% efficiency and 1000X ratio within an acceptance angle of ±2 degrees.

 

This study, we proposes a planar micro-optic concentrator for Solar cell by the optical simulation. The optical efficiency of the planar micro-optic concentrator with a 300X structure increase to 81.62% in Low-index cladding 1.32 refraction Index, and 81.37% in Low-index cladding 1.29 (LS-5229, PST Technology) refraction Index, respectively.

 

The (FA0.8MA0.15Cs0.05)PbBrxIy perovskite film could tune the band gap from 1.53 eV to 1.97 eV by low-temperature 1-step spin-coating technique. The 1.7 eV perovskite device obtained PCE ~16%. Our results pave the way for further investigation on the use of these materials in perovskite-Si tandem technology relevant applications.