# Enhanced Photovoltaic Performance of Perovskite Solar Cells by Co-Doped Spinel Nickel Cobaltite Hole Transporting Layer

## TL;DR

This study demonstrates that co-doping spinel nickel cobaltite as a hole transport layer significantly improves the efficiency of perovskite solar cells by enhancing hole extraction and device performance.

## Contribution

The paper introduces a novel co-doped spinel nickel cobaltite hole transport layer fabricated via solution combustion and doctor-blading, leading to improved solar cell efficiency.

## Key findings

- Achieved a power conversion efficiency of 16.5%.
- Observed increased ionization potential with co-doping.
- Revealed surface stoichiometry changes due to Cu cation substitution.

## Abstract

Solution combustion synthesized hole transport layer of co-doped spinel nickel cobaltite were fabricated using doctor-blading technique for planar inverted perovskite solar cells. Perovskite solar cells incorporating Co-doped spinel nickel cobaltite shown an increase in device performance parameters compared to un-doped spinel nickel cobaltite, leading to PCE of 16.5%. X-ray photoelectron spectroscopy measurements revealed the tendency of Cu cations to replace preferably the surface Ni atoms changing the surface stoichiometry of spinel nickel cobaltite inducing a cathodic polarization. Ultraviolet photoelectron spectroscopy measurements unveiled the increase of the ionization potential by 0.1 eV for co-doped spinel nickel cobaltite film compare to undoped spinel nickel cobaltite-based hole transporting layer. We attribute the enhanced PCE of inverted perovskite solar cells presented due to improved hole extraction properties of co-doped spinel nickel cobaltite hole transporting layer.

---
Source: https://tomesphere.com/paper/1906.02432