Alleviating defects in perovskites using single-walled carbon nanotubes

Abstract

Single-walled carbon nanotubes (SWCNTs) are representative one-dimensional materials that show exceptional optical and electronic properties with various tuneable bandgaps. SWCNTs can be integrated into a variety of photovoltaics particularly, perovskite solar cells (PSCs) based on a high level of functionality and purity. In this topical review, we discuss the fundamentals of SWCNTs applied to PSCs as an electron-transporting layer (ETL), hole-transporting layer (HTL), photoactive layer, and interfacial materials from the literature. Firstly, SWCNTs in PSCs and their defect control properties improving the devices are discussed. Subsequently, electrical and morphological improvement of semiconducting SWCNT (S-SWCNT)-added PSCs and other types of CNTs used in PSCs are discussed chronologically. The review and discussion layout the strategies of incorporating SWCNTs within the design frame of next-generation PSCs towards the improvement of the device performance via defect passivation.

Inorganic Cs2TeX6 (X = Cl, Br, I) Lead-Free Vacancy-Ordered Double-Perovskite Absorber-Based Single-Junction Solar Cells with a Higher Efficiency of ∼24%: Theoretical Insights

“…Additionally, poor V OC , defects, band and electron affinity mismatch, etc., are responsible for the low PV performance of VoDP-based devices. Therefore, to achieve the optimum PV performance based on these types of perovskite materials, various material synthesis approaches may be followed: e.g., (a) using thermal evaporation or aerosol-assisted CVD rather than a simple solution-processing technique in conjunction with an iodine-rich synthesis method to produce relatively uniform morphology and fewer intrinsic defects, (b) passivation of surfaces and interfaces to alter the grain size and carrier extraction characteristics, etc . Recently, carbon nanotubes have also been found to be effective in charge carrier transportation, and as a result, they can be incorporated as charge transporting materials in the future …”

Recent Advances in Dispersant Technology for Carbon Nanotubes toward Energy Device Applications

“…At the same time, SWCNTs are favored in solar cell applications because of their lower optical density [50,52] and suitable bandgap. [53][54][55] Table 1 lists the mechanical and electrical properties and costs of SWCNTs, DWCNTs, and MWCNTs. Rols et al [56] measured SWCNT distribution by reading the Raman-active A 1g radialbreathing mode frequency.…”

“…At the same time, SWCNTs are favored in solar cell applications because of their lower optical density [ 50,52 ] and suitable bandgap. [ 53–55 ]…”