Electron transport interface engineering with pyridine functionalized perylene diimide-based material for inverted perovskite solar cell

Construction of Efficient and Stable FAPbI3 Perovskite Solar Cells through Bifunctional Ionic Liquid‐Assisted Crystallization and Defect Passivation

“…[ 1–7 ] In the past decade, the record power conversion efficiency (PCE) of all‐solid‐state single‐junction thin‐film PSCs has jumped from 9.7% to 25.7%, mainly benefiting from the enormous compositional and interface engineering. [ 8–14 ] For PSCs achieving record PCE and stability, the perovskite layer was turned from the original MAPbI 3 ‐ to FAPbI 3 ‐based compositions. Substituting MA with a slightly larger monovalent cation FA could reduce the bandgap of perovskite to approach the S–Q optimum.…”

Constructing Efficient Hole Transport Material through π-Conjunction Extension for Perovskite Solar Cell

“…Among several spiro-type HTMs, spiro-[fluorene-9,90-xanthene] (SFX) core-based molecules possess facile synthesis steps and excellent optoelectronic properties, rendering SFX a promising core structure for the development of charge transport materials, especially HTMs. 27,28 Xu and Bi et al applied SFX-based HTMs X60 and X59 in PSCs, respectively, and achieved comparable PCEs (19.84% and 20.8%) to a wellknown spiro-OMeTAD device. At the same time, these two HTMs have obvious cost advantages over spiro-OMeTAD.…”

“…Perovskite solar cells (PSCs) are emerging as a hot spot in the photovoltaic field due to numerous merits such as low production cost, ease of device fabrication, excellent photoelectric properties, etc. − In the past decade, PSCs have made a major breakthrough in photovoltaic performance with the certificated power conversion efficiency (PCE), which rapidly grew from 3.8% to 25.7%. − The charge transport layers, playing the role of charge extraction/transport and suppressing nonradiative recombination, are critical for highly efficient PSCs. ,− To date, 2,2′,7,7′-tetrakis­[ N , N -bis­( p -methoxyphenyl) amino]-9,9′-spirobifluorene (spiro-OMeTAD) and poly­[bis­(4-phenyl)­(2,4,6-trimethylphenyl)­amine (PTAA) are the most commonly used hole transport materials (HTMs). − Although they achieved satisfactory efficiencies, the complex synthetic route and purification process of spiro-OMeTAD and PTAA make the device cost a bottleneck for large-scale applications. Numerous researches have focused on developing novel, low-cost, and highly efficient HTMs, and increasing molecular dipoles, regulating molecular energy levels, and imitating the three-dimensional structure of spiro-OMeTAD are proved to be effective design strategies to develop efficient HTMs. ,− The spiro structure will bring a steric cross configuration to enhance the charge transport between molecules and, at the same time, improve the solubility of the material and film formation property. Among several spiro-type HTMs, spiro-[fluorene-9,90-xanthene] (SFX) core-based molecules possess facile synthesis steps and excellent optoelectronic properties, rendering SFX a promising core structure for the development of charge transport materials, especially HTMs. , Xu and Bi et al applied SFX-based HTMs X60 and X59 in PSCs, respectively, and achieved comparable PCEs (19.84% and 20.8%) to a well-known spiro-OMeTAD device.…”

“…Numerous researches have focused on developing novel, low-cost, and highly efficient HTMs, and increasing molecular dipoles, regulating molecular energy levels, and imitating the three-dimensional structure of spiro-OMeTAD are proved to be effective design strategies to develop efficient HTMs. ,− The spiro structure will bring a steric cross configuration to enhance the charge transport between molecules and, at the same time, improve the solubility of the material and film formation property. Among several spiro-type HTMs, spiro-[fluorene-9,90-xanthene] (SFX) core-based molecules possess facile synthesis steps and excellent optoelectronic properties, rendering SFX a promising core structure for the development of charge transport materials, especially HTMs. , Xu and Bi et al applied SFX-based HTMs X60 and X59 in PSCs, respectively, and achieved comparable PCEs (19.84% and 20.8%) to a well-known spiro-OMeTAD device. At the same time, these two HTMs have obvious cost advantages over spiro-OMeTAD. , Seok and co-workers constructed two new fluorene-terminated HTMs termed DM and SFX-DM with spiro-bifluorene and SFX cores, respectively, demonstrating the feasibility and versatility of the fluorene-terminated strategy to design HTMs .…”

Molecular Engineering of Peripheral Substitutions to Construct Efficient Acridine Core-Based Hole Transport Materials for Perovskite Solar Cells

“…According to the development history of PSC, the rapid increase of PCE is closely related to the engineering of composition and crystallization behavior of the perovskite absorber layer, − the development of new hole/electron transport materials (HTMs/ETMs), ,− and the modification of the charge transport interface. ,− Moreover, the previous research proved that HTMs have a pivotal position in ensuring efficient charge carrier transport through extracting photogenerated holes from the perovskite absorbing layer and block photogenerated electrons. Besides that, HTMs can also act as a protective layer for the perovskite layer, stopping the perovskite from being degraded by water vapor, oxygen, and so forth.…”