Details

Autor(en) / Beteiligte

• Chen, Xiaoqing
• Shirai, Yasuhiro
• Yanagida, Masatoshi
• Miyano, Kenjiro

Titel

Photocarrier dynamics in perovskite-based solar cells revealed by intensity-modulated photovoltage spectroscopyElectronic supplementary information (ESI) available: (1) Comparison between IMVS and TPV. (2) Experimental details of device characterization. (3) Shunt resistance and the IMVS feature in the low power region. (4) Math solution to separate τslow and τfast. (5) Sublinear power dependence in the presence of only free electrons and holes. See DOI: 10.1039/c8cp01227j

Erscheinungsjahr

2018-07

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We studied perovskite photovoltaic devices with intensity-modulated photovoltage spectroscopy. Two coexisting relaxation times are found in accordance with the results of previous impedance spectroscopy (IS) measurements. The slower time constant is independent of the light power while the faster one is inversely proportional to the light power. We employed the surface polarization picture used in the IS analysis augmented by a plausible assumption that the surface polarization is proportional to the light intensity to explain the inverse power dependence of the fast time constant. Because the surface polarization results from the surface accumulated charges, its lateral (parallel to the electrode) distribution and dynamics should be known. We present evidence that the surface accumulated charges indeed form a two-dimensional layer, and have a finite binding energy and a diffusion length. Thermally activated recombination between surface accumulated carriers and the bulk free carriers in perovskite solar cells.