Restrained light-soaking and reduced hysteresis in perovskite solar cells employing a helical perylene diimide interfacial layer

Abstract

An n-type helical molecule perylene diimide (PDI2) has been explored as an efficient interfacial layer between TiO2 and perovskite, which can restrain the light-soaking instability and reduce hysteresis in perovskite solar cells. A champion device PCE of 19.84% has been achieved after incorporating the PDI2 interlayer.

Unravelling the effects of oxidation state of interstitial iodine and oxygen passivation on charge trapping and recombination in CH3NH3PbI3 perovskite: a time-domain ab initio study

“…1a) by a factor of 2.7. This study reveals the impact of oxidation state of interstitial iodine defects on charge dynamics and rationalizes the phenomenon observed in the experiment that oxygen can be responsible for the enhanced perovskite solar cell performance and PLQY [45][46][47][48][49] and reduced hysteresis, 57 providing valuable guidelines for the design of highperformance perovskite photovoltaic devices. .…”

“…First, the obtained data show that IO 3 À1 defect suppresses the motions of MA, Pb, and I and is responsible for a decreased NA coupling and reduced current-voltage hysteresis. 57 Second, oxygen passivation also slows the motion of interstitial iodine atom compared to that in the defective perovskites. Third, the rootmean-square displacement velocity of oxygen atoms themselves is smallest.…”

Perylene Diimide‐Based Electron‐Transporting Material for Perovskite Solar Cells with Undoped Poly(3‐hexylthiophene) as Hole‐Transporting Material

“…Because the synthesis of fullerene‐based ETMs is longwinded and complicated owing to multistep syntheses and difficult purification, non‐fullerene ETMs, such as rylene‐based organic small molecules, naphthalene diimide (NDI)‐based polymers and small molecules, and coronene diimide and indacenodithiophene small molecules, are also studied for PVSCs. Among these non‐fullerene ETMs, perylene diimide (PDI)‐based ETMs have attracted much attention, owing to their high electron nucleophilic potential and strong electron‐receiving power . Benefiting from rigid, planar p‐skeletons that are conducive to ordered molecular packing, PDI is a popular skeleton unit of liquid crystal molecules.…”

“…Among hole-transporting materials( HTMs) for PVSCs, poly(3-hexylthiophene) (P3HT) gives the devices the highest stability and reproducibility.T herefore, PVSCs with the structure of indium tin oxide (ITO)/ETM/perovskite/P3HT/ their high electron nucleophilic potential and strong electronreceiving power. [44][45][46][47][48][49][50][51] Benefiting from rigid, planar p-skeletons that are conducive to ordered molecular packing, PDI is ap opular skeleton unit of liquid crystal molecules. This rich source of new ETMs for PVSCs needs to be exploited more widely.…”

Molecular Aggregation of Naphthalene Diimide(NDI) Derivatives in Electron Transport Layers of Inverted Perovskite Solar Cells and Their Influence on the Device Performance

“…[50,51] One solution to address this problem is to adopt molecular twisting throughf using two coplanarr igid PDI directly or building 3D type molecule such as comprising a tetraphenylethylene core with four PDIs surrounded. [52,53] Here, we tried to Figure out another simple way,w hich is attaching specific side chains onto the framework of NDI derivatives elaborately to solve this aggregation problem.2 -(2-Methyl-4Hchromen-4-ylidene)malononitrile (CMCN) group was employed as the functional group due to its stronge lectron-accepting property through two nitrile groups. [54] By carefullya djusting the positiona nd the amount of side chains on the framework of NDI derivatives, the extent of molecular interaction anda ggregation in the solid state could be successfully modified in our work.…”