High-Detectivity Perovskite Photodetector Using Combustion-Processed NiO as -Type Buffer Layer.

We fabricated a photodetector device consisting of ITO/NiO/Perovskite/PCBM/BCP/Ag. The NiO layer was deposited using the sol-gel and combustion processes. Combustion-processed NiO films have advantages such as low annealing temperature, improved perovskite film quality, and better photodetector performance compared to the sol-gel processed NiO film.

P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer.

A low leakage current is critical for achieving organic photodetectors (OPDs) with high detectivity. The insertion of buffer layers is an effective approach for reducing the reverse-biased leakage current. In this study, polyelectrolyte multilayers comprising polyethyleneimine (PEI) and polyacrylic acid (PAA) were introduced by a spin-assisted layer-by-layer technique into an OPD as a p-type buffer layer.

Enhanced photocurrent in organic photodetectors by the tunneling effect of a hafnium oxide thin film as an electron blocking layer.

To achieve high detectivity of organic photodetectors (OPDs), we investigated hafnium oxide (HfO) as an electron blocking layer in an attempt to obtain a low leakage current and high photocurrent by the tunneling effect. The prepared devices consisted of indium tin oxide (ITO)/HfO/(poly(3-hexylthiophene-2,5-diyl)[P3HT]:PCBM)/Yb/Al. To explore the tunneling effect in a hafnium oxide thin film, we fabricated a thin film using successive ionic layer deposition.

A Novel Approach for the Development of Moisture Encapsulation Poly(vinyl alcohol--ethylene) for Perovskite Solar Cells.

In this study, we developed the universal encapsulation method using poly(vinyl alcohol--ethylene) (EVOH) to improve the water stability of perovskite solar cells. In order to enhance the moisture barrier property, we utilized SiO and graphene oxide (GO) fillers in the EVOH matrix. First, UV-treated SiO increased the dispersibility in the EVOH matrix and made the penetrating path more complicated, which led to a better moisture barrier property.

Enhancing Planar Perovskite Solar Cell Performance by Doping Zr in TiO Layer.

In this work, a Zr-doped TiO layer is introduced into planar-structure perovskite solar cells via a simple sol-gel method. The prepared device configuration is ITO/PEDOT:PSS/CH₃NH₃PbICl/PCBM/Zr-TiO/Al. The performance of the perovskite solar cells was investigated through measurements of the current-voltage characteristics, impedance analysis, and photocurrent decay.