Conformal Loading Effects of P3CT-Na Polymers on the Performance of Inverted Perovskite Solar Cells

Abstract

The conformal loading effects of P3CT-Na polymers on ITO/glass samples were investigated using different concentrations of P3TC-Na/water solution, which significantly influenced the device efficiency of the resultant inverted perovskite solar cells. The obtained water-droplet contact angle images, surface morphological images, photoluminescence spectra and X-ray diffraction patterns show that the hydrophilic moiety of the P3CT-Na polymers plays an important role in the conformal loading effects, thereby resulting in a smoother perovskite crystalline film due to the formation of merged grains. It is noted that the average power conversion efficiency increases from 14.83% to 17.27% with a decrease in the concentration of the P3CT-Na/water solution from 60 wt% to 48 wt%.

Effects of bendable P3CT polymers layer on the photovoltaic performance of perovskite solar cells

“…The formation of π-π stacking P3CT polymers can help the loading of edge-on P3CT polymers on top of the ITO/glass substrate due to the hydrophilic surface (see figure 2(c)). The formation of hydrogen-bonding between P3CT polymers can help the bending ability of 2D layer-like P3CT polymers (see figure 2(d)) [42,43], which increases the loading efficiency on top of the atomically non-flat ITO thin film [44]. Figure 3 presents the AFM images and water droplet contact angle images of the P3CT/ITO/glass samples.…”