Improving Efficiency of Semitransparent Organic Solar Cells by Constructing Semitransparent Microcavity

Abstract

Semitransparent organic solar cells have become attractive recently because of their photon harvesting in the near-infrared and ultraviolet range and passing in the visible light region. Semitransparent organic solar cells with Glass/MoO3/Ag/MoO3/PBDB-T:ITIC/TiO2/Ag/PML/1DPCs structure have been studied in this work and the effects microcavity with 1-dimensional photonic crystals (1DPCs) on the solar cell performance such as the power conversion efficiency, the average visible transmittance, and the color coordinates in the CIE color space are investigated. The drift-diffusion model, including the density of exactions, and their displacement is used to model the devices. The model shows that the presence of microcavity can improve the power conversion efficiency by about %17 in comparison with the absence of microcavity. Although the transmission is decreasing slightly using microcavity does not change the color coordinates much and the device can transmit high-quality light with near-white sensation to the human eye.

The Role of Device Architecture and Interfacial Layer on Performance of Semitransparent Organic Solar Cells

“…Semitransparent organic solar cells (ST-OSCs) possess huge potential for constructing wearable energy sources and functional building integration in comparison to their inorganic counterparts. [1][2][3][4][5][6][7] Recently, tremendous efforts have focused on developing novel materials with the enhancement of nearinfrared utilization while maintaining the weaker visible light absorption to deal with the tradeoff between the power conversion efficiency (PCE) and average visible transmittance (AVT). [8][9][10][11] Additionally, employing the extra optical coupling architectures such as the microcavity-embedded electrodes or the Bragg reflector with periodic arrangement of the refraction indexes suggests promising potentials for practical applications such as the windows with neutral chrominance or decoration to cater the public aesthetic values.…”