SILVACO TCAD Based Investigation of P3HT: PCBM-Based Bulk Heterojunction Organic Solar Cell

Abstract

In this work, a Bulk Hetero Junction (BHJ) Organic Solar Cell (OSC) based on P3HT: PCBM-blend has been designed, modeled, implemented, investigated, and analyzed in a Silvaco TCAD environment. The thin P3HT: PCBM-blended heterojunction layer is the photoactive absorber, where the donor/acceptor increases the diffusion length and reduces the Langevin recombination significantly. A thinner layer of PEDOT: PSS organic material acts as the hole transport layer to enhance the whole transport. cc is the front electrode, and aluminum is the bottom electrode. The OSC has been modeled considering the singlet dissociation and Langevin recombination. Simulations have been conducted to obtain the Current Voltage (CV) characteristics and the External Quantum Efficiency (EQE) plots. The deduced performance metrics of the proposed OSC demonstrates a short circuit current density (J_SC) of 21.95 mA/cm², an open circuit voltage (V_OC) of 0.7 V, a Fill Factor (FF) of 25.73% and a Power Conversion Efficiency (PCE) of 3.95%, where the EQE surpasses a value of 25% over the visible and infra-red wavelength range (0.3μm -1.5 μm).