Work

Near-band-edge optical responses of solution-processed organic–inorganic hybrid perovskite CH3NH3PbI3on mesoporous TiO2electrodes

Year: 2014

Type: article

Abstract: We studied the near-band-edge optical responses of solution-processed CH 3 NH 3 PbI 3 on mesoporous TiO 2 electrodes, which is utilized in mesoscopic heterojunction solar cells. Photoluminescence (PL) and PL excitation spectra peaks appear at 1.60 and 1.64 eV, respectively. The transient absorption spectrum shows a negative peak at 1.61 eV owing to photobleaching at the band-gap energy, indicating a direct band-gap semiconductor. On the basis of the temperature-dependent PL and diffuse reflectance spectra, we clarified that the absorption tail at room temperature is explained in terms of an Urbach tail and consistently determined the band-gap energy to be ∼1.61 eV at room temperature.

Source: Applied Physics Express

DOI: 10.7567/apex.7.032302

Authors: Yasuhiro Yamada, Toru Nakamura, Masaru Endo, Atsushi Wakamiya, Yoshihiko Kanemitsu

Institutions: Kyoto University, Kyoto University Institute for Chemical Research

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funders: Core Research for Evolutional Science and Technology, Precursory Research for Embryonic Science and Technology