Inverted structure perovskite solar cells: A theoretical study

TL;DR

This theoretical study investigates inverted perovskite solar cells with NiO and spiro-MeOTAD, optimizing layer thicknesses and back contact materials to enhance efficiency and understanding band alignment effects.

Contribution

It provides a comprehensive theoretical analysis of inverted perovskite solar cells focusing on layer optimization and material properties for improved performance.

Findings

Ni and Co are suitable back contact metals.

Efficiency decreases linearly with temperature.

Optimal band gap and electron affinity ranges are identified.

Abstract

We analysed perovskite CH3NH3PbI3-xClx inverted planner structure solar cell with nickel oxide (NiO) and spiro-MeOTAD as hole conductors. This structure is free from electron transport layer. The thickness is optimized for NiO and spiro-MeOTAD hole conducting materials and the devices do not exhibit any significant variation for both hole transport materials. The back metal contact work function is varied for NiO hole conductor and observed that Ni and Co metals may be suitable back contacts for efficient carrier dynamics. The solar photovoltaic performance showed a linear decrease in efficiency with increasing temperature. The electron affinity and band gap of transparent conducting oxide and NiO layers are varied to understand their impact on conduction and valence band offsets. A range of suitable band gap and electron affinity values are found essential for efficient device performance.