Vanadium Oxide‐Modified Triphenylamine‐Based Hole‐Transport Layer for Highly Reproducible and Efficient Inverted Perovskite Solar Cells

Abstract

Inverted perovskite solar cells (PSCs) often employ triphenylamine‐based materials, such as poly(triarylamine) (PTAA), as hole‐transporting layer (HTL). However, the high hydrophobic PTAA usually induces unsatisfactory perovskite growth, resulting in inferior efficiency and reproducibility. Herein, the vanadium oxide (VOx) film is introduced to modify hydrophobic PTAA layer and establish a hydrophilic surface for high‐quality perovskite film due to the decreased surface tension with improved perovskite solution spread, nucleation, and growth. The PSCs based on PTAA/VOx HTL exhibit high power conversion efficiency up to 18.9% with a sharp increase in comparison to the 16.5% of the control device. Moreover, the reproducibility is also significantly improved, showing a much smaller standard deviation of 1.75 for 40 devices compared to the control devices of 3.64. This work demonstrates that the introduction of VOx is a promising approach in producing high‐quality perovskite films on poor‐wetting PTAA layer for high‐performance inverted PSCs.

Recent Criterion on Stability Enhancement of Perovskite Solar Cells

“…In this context, an organic-inorganic hybrid state-of-the-art material, e.g., 2,2 ,7,7 -tetrakis-(N,N-di-p-methoxy-phenyl-amine)-9,9 -spiro-bifluorene (spiro-OMeTAD) has mainly been used so far in different research works due to its enhanced PV performance, amorphous nature, and optimal solubility in various organic solvents [51,60,162,[248][249][250]. Furthermore, poly(tri-arylamine, a polymeric organic material, has been introduced by many researchers to yield high certified PCEs in regular planar structured devices [155,167,[251][252][253]. However, in terms of stability, both materials have failed to gratify the researchers due to their various intrinsic properties.…”

Dopamine Hydrochloride-Assisted Synergistic Modulation of Perovskite Crystallization and Sn2+ Oxidation for Efficient and Stable Lead-free Solar Cells

“…Our group also developed a vapor incubation method to fabricate high-quality perovskite films, leading to a PCE of over 10% along with enhanced device stability . Since iodide (I – ) and alkylammonium (FA + and MA + ) ions are easy to volatilize in annealing and form vacancies, the fast nucleation process generates perovskite films with low vacancies and smooth morphology. − Thus, it is urgent to control the nucleation process for high-quality Sn perovskite films.…”

Triphenylene containing blue-light emitting semi-fluorinated aryl ether polymers with excellent thermal and photostability

“…They can be used for bottom-up synthesis to solutionprocessable nanographenes with band gap tunability for optoelectronic applications. [10][11][12] Polymers containing PAHs range from completely amorphous to crystalline nature and have attracted attention for the development of supercapacitors, 13 transistors, 14 solar cells, 15 semiconductor, 10 blue-light emitting lasers, 16 photovoltaics 17 etc. Numerous reports exist on stable red and green light-emitting devices.…”