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MXenes-based perovskite solar cell achieves 23.66% efficiency

A UK-Chinese research group claims to possess achieved remarkable efficiency and stability for a solar cell predicated on an electron transport layer doped with two-dimensional titanium carbide (Ti3C2Tx). The champion cell comes with an efficiency of 23.66%, an open-circuit voltage of just one 1.095 V, a short-circuit current of 25.07 mA/cm2, and fill factor of 83.18%.

Several scientists in China has designed a perovskite solar cell predicated on a functionalized two-dimensional titanium carbide (Ti3C2Tx), that is also called MXene.

MXenes compounds take their name from their graphene-like morphology and so are made via selective etching of certain atomic layers from the bulk crystal referred to as MAX. Recently, MXenes materials show promise for used in PV technology because of their unique optoelectronic properties, such as for example their large charge carrier mobility, excellent metallic conductivity, high optical transmittance, and tunable work function (WF).

The study team used two surface-functionalization approaches for MXene with dodecyltrimethoxysilane and fluoroalkylsilane (FOTS) molecules, respectively, to create a self-assembled monolayer on the MXene itself.

Initially, we added unmodified MXene to the electron transport layer (ETL), which didnt have a large impact, said researcher Li Yin. However, we realized that slightly adjusting the chemical structure of the MXene could also modify another materials in the electron transport layer. This might reduce barriers to electron movement and enhance the performance of the solar panels. We were right.

Based on the researchers, the functionalized MXene dopants led to a more substantial grain size and an increased open-circuit voltage for the PV device. The solar cell architecture includes an indium tin oxide (ITO) substrate, an electron transport layer (ETL) predicated on Tin(IV) oxide (SnO2) and doped with MXene-H, the perovskite layer, a spiro-OMeTAD hole-blocking layer, and a silver (Ag) metal contact.

The champion solar cell constructed with this configuration achieved an electrical conversion efficiency of 23.66%, an open-circuit voltage of just one 1.095 V, a short-circuit current of 25.07 mA/cm2, and fill factor of 83.18%. A reference cell without MXene-H achieved an electrical conversion efficiency of 20.98%, an open-circuit voltage of just one 1.062 V, a short-circuit current of 25.01 mA/cm2, and fill factor of 80.60%.

Both optimal devices show higher moisture-resistance stability and operation stability, the scientists said. For light stability, it really is clear that after 1,000 h of illumination, these devices predicated on SnO2-MH because the ETL maintains almost 80% of its initial efficiency.

They presented the cell technology in Functionalized-MXene-nanosheet-doped tin oxide enhances the electrical properties in perovskite solar panels, that was recently published in Cell Reports Physical Science. The study group includes academics from the University of Science and Technology of China, the Xian Jiaotong-Liverpool University, and the University of Liverpool in britain.

This work offers a promising potential direction toward achieving high-quality SnO2 ETLs, and we think that the required modifications to the dopant could further improve the device performance preferably, they concluded.

Separately, another international research group recently conducted a review to discover how two-dimensional transition metal carbides and nitrides referred to as MXenes could possibly be used as materials for solar panels. They presented their findings in 2D MXene: A Potential Candidate for Photovoltaic Cells? A CRUCIAL Review, that was recently published in Advanced Science. The study group includes scientists from Dongguk University, Korea University, and Hamad Bin Khalifa University (HBKU).

This systematic review is both likely to provide a solution to realize the diverse nature of MXene composites from the different perspective, and open new directions to get solutions for next-generation PV applications, the scientists said.

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