CH₃NH₃PbI₃planar perovskite solar cells with antireflection and self-cleaning function layers

Abstract

We report CH3NH3PbI3planar perovskite solar cells with multifunctional inverted micro-pyramidal structured polydimethylsiloxane antireflection layers for enhancing the device efficiency.

Reduction in the Interfacial Trap Density of Mechanochemically Synthesized MAPbI3

“…The capacitance that corresponds to ionic and electronic accumulation as a function of frequency can be obtained from the imaginary impedance and is shown in Figure 3 (c) (d) 13 whereas the peak at low frequency ~1 Hz has been associated with the ionic movement. 43,44,45 From the high frequency response centered at ~10 4 Hz with weak bias dependence, it could be expected that the transport and diffusion across the absorber layer or absorber/HTM interface in the studied devices are similar and cannot limit their performance. Thus, it becomes important to recognize the physical origin of high frequency spectra before assigning to the transport phenomena; thereby taking the values of R S and τ HF (from high frequency intercept of IS), the obtained capacitance equivalent to geometrical capacitance (C g ) signifies τ HF to be dominated by and 0.52 eV in MAPbI 3 (m) devices can be ascribed to the movement of iodine vacancies, as was observed by Eames et al 49 We find that the defect density at deeper defect levels mostly located on the surface of perovskite absorber layer is nearly an order of magnitude lower in MAPbI 3 (m) based device.…”

Efficient Light Management by Textured Nanoimprinted Layers for Perovskite Solar Cells

“…The textured interfaces can either be integrated inside the cell structure by texturing the front electrode, either the transparent conductive oxide 14 or charge transport material, [15][16][17] or by applying light management (LM) foils on the front glass side in a superstrate cell configuration. 18,19 Textured foils have advantage over the ARCs, especially in planar devices with flat interfaces, as besides reducing the reflection they can scatter (for nano-sized texture features) or refract (for micro-sized features) light, which prolongs the optical path.…”

“…18,19,26 They all analyze small devices and do not predict the full potential of the LM foil. Also, no comprehensive experiment-versus-3D optical simulation study for inorganic-organic perovskite solar cells has been conducted yet, both without and with the light management (LM) foil.…”

Wide‐Bandgap Perovskite/Gallium Arsenide Tandem Solar Cells

“…Because subcells are electrically decoupled, the performance of 4T tandem could be evaluated by independently measuring the top‐cell under the incident light and the bottom‐cell under the filtered light through the top‐cell. Meanwhile, a PDMS textured foil (TF) (Figure b) can be used to reduce reflectance from the glass surface of perovskite PV device and to enhance transmittance through the structure . In Figure c and Figure S18 (Supporting Information), T and R of semitransparent perovskite devices under six different cases of light illumination from glass side (Figure c: no TF without ARC, no TF with ARC, TF without ARC, and TF with ARC) and from ITO side (Figure S18, Supporting Information: without ARC and with ARC) are depicted.…”