Organic functional materials based buffer layers for efficient perovskite solar cells

Conjugated Polymers for Photon-to-Electron and Photon-to-Fuel Conversions

“…), or polymers (PEDOT:PSS, PTAA, etc. ). ,− Among them, CPs possess the advantages of good film-formation properties, orthogonal solution-processing capabilities, and suitable charge mobilities, hence device based CPs exhibiting the potential of large-scale processing. ,− …”

“…Solution-processing CPs based on naphthalene diimide-based (NDI), perylene diimide (PDI), and thiophene units were applied as ETLs for PVSCs (Figure ). ,,, As naphthalene diimide exhibits a high electron affinity and planar aromatic units, NDI-based CPs possess good electron transporting properties. Therefore, they are suitable as ETLs for PVSCs .…”

“…Commercial PEDOT:PSS consists of different PEDOT/PSS ratios; depending of the types for AI4083, PH1000, and PH500, the weight ratio ranges from 1/6 to 1/2.5. PEDOT:PSS allows good light transmittance in the visible range as well as an excellent electrical conductivity and a WF of ∼5.1 eV, therefore, widely applied as the HTL in both PSCs and PVSCs. ,,, For instance, Snaith et al developed planar inverted MAPbI 3– x Cl x PVSCs based on a FTO/PEDOT:PSS substrate, exhibiting PCEs of up to 10% on glass substrates and over 6% on flexible poly­(ethylene terephthalate) (PET) substrates. In contrast with inorganic HTLs (NiO x and V 2 O 5 ), polymeric PEDOT:PSS shows shallow energetic levels, resulting in the decreased photovoltage for derived PVSCs, thus decreasing photovoltaic performances.…”

Additive-Induced Film Morphology Evolution for Inverted Dion–Jacobson Quasi-Two-Dimensional Perovskite Solar Cells with Enhanced Performance

“…However, the device exhibited a low PCE of 3.81% and poor stability because perovskites would gradually dissolve in the liquid electrolyte . In recent years, the PCE values of PSCs devices have soared to a very high value by carefully optimizing the film composition, processing solvent and additives, and interfaces. − Nowadays, the highest certified record PCE had been promoted to 25.7% . However, traditional three-dimensional (3D) perovskites always suffered from insufficient device stability, particularly under moisture and oxygen.…”

Novel (X‐DADAD)n Polymers with Phenylene and Fluorene Blocks as Promising Electronic Materials for Organic and Perovskite Solar Cells

“…[6][7][8][9][10] Furthermore, conjugated polymers are also recognized as promising charge transport materials for PSCs, because their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels can be easily tailored for efficient charge extraction from the electrodes by modulation of the electrondonating or electron-withdrawing strength of D and A units. [11,12] High-performance PSCs comprise polymeric hole-transport materials (HTMs), which selectively extract the holes from the photoactive layer and facilitate their transport to the hole-collecting electrode, thus suppressing charge recombination and preventing the degradation processes at the metal/perovskite interface. [13][14][15] We have recently reported an approach to designing novel (X-DADAD) n conjugated polymers, which demonstrated improved optoelectronic properties in comparison with those of widely used (X-DAD) n structures.…”