Direct Observation of Long Electron-Hole Diffusion Distance in CH3NH3PbI3 Perovskite Thin Film
Citations Over TimeTop 1% of 2015 papers
Abstract
In high performance perovskite based solar cells, CH3NH3PbI3 is the key material. We carried out a study on charge diffusion in spin-coated CH3NH3PbI3 perovskite thin film by transient fluorescent spectroscopy. A thickness-dependent fluorescent lifetime was found. By coating the film with an electron or hole transfer layer, [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) or 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-OMeTAD) respectively, we observed the charge transfer directly through the fluorescence quenching. One-dimensional diffusion model was applied to obtain long charge diffusion distances in thick films, which is ~1.7 μm for electrons and up to ~6.3 μm for holes. Short diffusion distance of few hundreds of nanometer [corrected] was also observed in thin films. This thickness dependent charge diffusion explained the formerly reported short charge diffusion distance (~100 nm) in films and resolved its confliction to thick working layer (300-500 nm) in real devices. This study presents direct support to the high performance perovskite solar cells and will benefit the devices' design.
Related Papers
- → A novel 2D perovskite as surface “patches” for efficient flexible perovskite solar cells(2020)67 cited
- → Influence of deterioration of polymer solution on quenching crack in polymer quenching process for large forged products(2015)2 cited
- → Fuel-Borne Catalyst와 Perovskite로 구성된 복합촉매 시스템에 의한 디젤 탄소입자상 물질의 연소반응: 반응성능과 Perovskite 촉매조성 (La1-x A′xBO3: A′ = K, Sr; 0 ≤ x ≤ 1; B = Fe, Cr, Mn)의 상관관계(2018)1 cited
- Influence of Cooling Equipment on Quenching Effect(2005)
- → G0400301 Influence of deterioration of polymer solution on quenching crack in polymer quenching process for large forged products(2015)