MXene-Modulated Electrode/SnO₂ Interface Boosting Charge Transport in Perovskite Solar Cells

Abstract

Interface engineering is imperative to boost the extraction capability in perovskite solar cells (PSCs). We propose a promising approach to enhance the electron mobility and charge transfer ability of tin oxide (SnO2) electron transport layer (ETL) by introducing a two-dimensional carbide (MXene) with strong interface interaction. The MXene-modified SnO2 ETL also offers a preferable growth platform for perovskite films with reduced trap density. Through a spatially resolved imaging technique, profoundly reduced non-radiative recombination and charge transport losses in PSCs based on MXene-modified SnO2 are also observed. As a result, the PSC achieves an enhanced efficiency of 20.65% with ultralow saturated current density and negligible hysteresis. We provide an in-depth mechanistic understanding of MXene interface engineering, offering an alternative approach to obtain efficient PSCs.

Suppression of Nonradiative Recombination by Vacuum‐Assisted Process for Efficient Lead‐Free Tin Perovskite Solar Cells

“…[ 1–4 ] The power conversion efficiency (PCE) of lead (Pb) based perovskite solar cells (PVSCs) has surged to certified 25.5%, continuously approaching their Shockley‐Queisser (SQ) limit efficiency, which makes it strongly competitive for the next generation of photovoltaic technology. [ 5–11 ]…”

MXenes for Solar Cells

“…Recently, Wang et al reported a perovskite solar cell with a thin Ti 3 C 2 T x MXene layer inserted between the F-doped SnO 2 (FTO) electrode and the SnO 2 ETL [ 79 ], and Fig. 8 g, i shows the architecture and cross-sectional SEM image of the device.…”

Application of MXenes in Perovskite Solar Cells: A Short Review

“…In 2020, Wang et al, reported a champion stabilized PCE of 20.65% with a V OC of 1.11 V and highly improved J SC of 24.34 mA·cm −2 , by introducing a thin layer of Ti 3 C 2 T x MXene between the SnO 2 ETL and electrode of PSC [ 84 ]. As can be seen from Figure 7 f, the introduction of Ti 3 C 2 T x MXene layer between SnO 2 ETL and electrode optimized the conduction band alignment, resulting in improved charge transfer kinetics and better performance.…”