access icon free High-crystallinity and large-grain CH3NH3PbI3 thin films for efficient TiO2 nanorod array perovskite solar cells

The high-crystallinity, large-grain and full-coverage CH3NH3PbI3 thin films are successfully prepared by converting the PbI2·dimethyl sulphoxide (DMSO) complex thin films at the optimum annealing temperature and time of 140°C and 10 min in the glove box with the relative humidity of 10–15%. The influence of the annealing temperature and time on the crystallinity, surface morphology, optical absorption of CH3NH3PbI3 thin films is systematically investigated and the photovoltaic performance of the corresponding TiO2 nanorod array perovskite solar cells is evaluated. The results reveal that the crystallinity of CH3NH3PbI3 thin films can be improved and their grain sizes gradually increase from 200–300 to 300–500 and 500–800 nm with the increase of the annealing temperature from 100 to 120 and 140°C. The TiO2 nanorod array perovskite solar cells with the optimum annealing temperature and time of 140°C and 10 min exhibit the best photoelectric conversion efficiency (PCE) of 16.11% and the average PCE of 15.62 ± 0.49%.

Inspec keywords: grain size; lead compounds; titanium compounds; infrared spectra; annealing; photoconductivity; ultraviolet spectra; surface morphology; thin film devices; thin films; visible spectra; nanorods; solar cell arrays; photovoltaic effects; organic-inorganic hybrid materials

Other keywords: temperature 100 degC to 140 degC; glove box; nanorod array perovskite solar cells; relative humidity; photoelectric conversion efficiency; annealing temperature; annealing time; high-crystallinity thin films; photovoltaic performance; surface morphology; optical absorption; PbI2·dimethyl sulphoxide complex thin films; TiO2; time 10 min; large-grain thin films; grain size

Subjects: Solar cells and arrays; Infrared and Raman spectra in organic crystals; Solid surface structure; Photoelectric conversion; solar cells and arrays; Thin film growth, structure, and epitaxy; Microstructure; Visible and ultraviolet spectra of other nonmetals; Other heat and thermomechanical treatments; Optical properties of organic compounds and polymers (thin films, low-dimensional and nanoscale structures)

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2017.0477
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