Abstract
In recent years, organo-halide perovskite solar cells have garnered a surge of interest due to their high performance and low-cost fabrication processing. Owing to the multilayer architecture of perovskite solar cells, interface not only has a pivotal role to play in performance, but also influences long-term stability. Here we have employed diverse morphologies of electron selective layer (ESL) to elucidate charge extraction behavior in perovskite solar cells. The TiO2 mesoporous structure (three-dimensional) having varied thickness, and nanocolumns (1-dimensional) with tunable length were employed. We found that a TiO2 electron selective layer with thickness of about c.a. 100 nm, irrespective of its microstructure, was optimal for efficient charge extraction. Furthermore, by employing impedance spectroscopy at different excitation wavelengths, we studied the nature of recombination and its dependence on the charge generation profile, and results showed that, irrespective of the wavelength region, the fresh devices do not possess any preferential recombination site, and recombination process is governed by the bulk of the perovskite layer. Moreover, depending on the type of ESL, a different recombination mechanism was observed that influences the final behavior of the devices.
Highlights
During recent years, organic–inorganic halide perovskite solar cells (PSCs) have made colossal progress, competing head-to-head at lab scale with mature Silicon-based or other thin-film-based photovoltaic technologies [1]
The results showed an increment in power conversion efficiency (PCE), mostly due to better charge extraction after modifying the TiO2 layer
It is known that the Voc is strongly related to the layer (1:7, Ø30 nm), 100 nm TiO2 nanocolumns and planar devices exhibit comparatively lower dark onset voltage point of the device measured in the dark under a forward bias, and delay in the onset voltage point of theof device result in under high Voc
Summary
Organic–inorganic halide perovskite solar cells (PSCs) have made colossal progress, competing head-to-head at lab scale with mature Silicon-based or other thin-film-based photovoltaic technologies [1]. These results are in line with the absorbance spectra obtained for the range of mA·cm fitting the J-V curve) based on 100 nm TiO2 nanocolumns and thin mesoporous layers (1:7 dilutions, different configuration (Figure S2).
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