Optimized Organometal Halide Perovskite Planar Hybrid Solar Cells via Control of Solvent Evaporation Rate

Abstract

Organometallic halide perovskite-based solar cells have exhibited rapidly increasing efficiencies through the use of mesoporous composites. The addition of materials used in organic solar cells to perovskite-based solar cells (PSCs) enables the fabrication of low-cost, flexible, low-temperature, solutionprocessed PSCs. However, obtaining sufficient coverage of the organic layer, usually poly(3,4-ethylenedioxythiophene)−poly(styrenesulfonate) (PEDOT:PSS), with CH 3 NH 3 PbI 3−x Cl x films remains difficult in spite of the advances. In this study, we investigated the influence of controlling the solvent evaporation rate on the degree of PEDOT:PSS surface coverage by CH 3 NH 3 PbI 3−x Cl x . We determined that an adequately fast spinning speed, drying at room temperature, and stepwise ramp annealing are critical for obtaining optimized planar hybrid perovskite solar cells with an ITO/PEDOT:PSS/CH 3 NH 3 PbI 3−x Cl x /PCBM/Al structure and efficiencies of up to 11.8%.

All-optical THz wave switching based on CH3NH3PbI3 perovskites

“…Kang et al . have recently reported a comparative investigation of CH 3 NH 3 PbI 3 perovskites according to their fabrication methods and identified that more suitable devices for practical uses are based on one-step solution processing owing to the narrow distribution of the device efficiency and the stability under ambient conditions2425. In the present report, we conducted a quantitative study of perovskite-based THz switches.…”

Hybrid Perovskites: Effective Crystal Growth for Optoelectronic Applications

“…Hydroiodic acid (HI) additives into MAPbI3 precursor in DMF also showed a similar effect for film nucleation and crystallizations and subsequently dense film formation. [121] Interestingly, planar heterojunction solar cells demonstrates 17% of PCE regardless of voltage scan rate with minimized hysteresis, which is attributed to the improved film homogeneity, fast charge transfer, long diffusion length and 10-fold low trap density of MAPbI3 film.…”

Exploration of fabrication methods for planar CH3NH3PbI3 perovskite solar cells

“…However, when the same device, except DPP devices, was continuously scanned, for all conditions, we frequently observed that V oc continuously increases but J sc decreases, probably resulting from the light soaking effect already known [39] (when the same device for each fabrication method was continuously scanned 12 times for 3 min, one result of the continuous scan performance is shown in Table S1). Even when the same device was continuously scanned by changing the scanning rate, as shown in Histograms & the skeletal box-and-whisker plots of photovoltaic performance parameters [40] for the first scan of 60 devices per each fabrication methods are also shown in Fig. 3a.…”