Hole-Transport Management Enables 23%-Efficient and Stable Inverted Perovskite Solar Cells with 84% Fill Factor

Abstract

NiOx-based inverted perovskite solar cells (PSCs) have presented great potential toward low-cost, highly efficient and stable next-generation photovoltaics. However, the presence of energy-level mismatch and contact-interface defects between hole-selective contacts (HSCs) and perovskite-active layer (PAL) still limits device efficiency improvement. Here, we report a graded configuration based on both interface-cascaded structures and p-type molecule-doped composites with two-/three-dimensional formamidinium-based triple-halide perovskites. We find that the interface defects-induced non-radiative recombination presented at HSCs/PAL interfaces is remarkably suppressed because of efficient hole extraction and transport. Moreover, a strong chemical interaction, halogen bonding and coordination bonding are found in the molecule-doped perovskite composites, which significantly suppress the formation of halide vacancy and parasitic metallic lead. As a result, NiOx-based inverted PSCs present a power-conversion-efficiency over 23% with a high fill factor of 0.84 and open-circuit voltage of 1.162 V, which are comparable to the best reported around 1.56-electron volt bandgap perovskites. Furthermore, devices with encapsulation present high operational stability over 1,200 h during T90 lifetime measurement (the time as a function of PCE decreases to 90% of its initial value) under 1-sun illumination in ambient-air conditions.

One-step dual-additive passivated wide-bandgap perovskites to realize 44.72%-efficient indoor photovoltaics

“…S18, ESI†), resulting in efficient hole transportation. 21,32–35 The PbI 2 peak from XRD spectra in the target perovskite film is remarkably decreased, which is ascribed to the formation of 2D perovskites confirmed by GIWAXS (Fig. 2g and h).…”

“…Two characteristic diffraction spots at low q values in the target perovskite films further confirm the presence of 2D perovskite phases (PEA 2 PbI 4 and OAm 2 PbI 4 ). 32,33,36–38 Moreover, FIB-cut 3D WBG perovskite film incorporating OAm + ligands was also examined by HR-TEM measurements (Fig. 2i–l).…”

High-Performance Sn-Based Quasi-Two-Dimensional Perovskite Photodetectors by Altering Dark Current Shunt Pathways

“…Halide perovskites are extensively applied in the field of photovoltaics due to their excellent optoelectronic properties, such as large light absorption coefficient, high carrier diffusion rates, long exciton diffusion length and lifetimes, and tunable band gaps. − The application fields of halide perovskites span from perovskite solar cells, − PDs, − to light-emitting diodes. − PDs based on halide perovskites have great potential in practical applications, given their merits in material cost, solution processability, and optoelectronic performance. PDs with a vertical structure have attracted significant interest due to their capability of swiftly extracting photogenerated carriers through their electron and hole transport layers, which decrease the reliance on external power sources and hence facilitates miniaturization and portability. , Zhou et al developed a photon counter utilizing polycrystalline perovskite PDs with vertical structure, the properties of the photon counter that parallels the performance of commercial silicon photomultiplier tubes .…”

Crystallization Kinetics of Perovskite Films by a Green Mixture Antisolvent for Efficient NiOx-Based Inverted Solar Cells

“…In addition, the optimized compatible processes affect the quality of the perovskite thin films and result in differences in the efficiency and stability of the solar cells, including the concentration, annealing temperature, annealing duration, relative humidity, operation trick, and order. Among the green antisolvents, the EA and IPA are widely employed by researchers due to their relatively low boiling points and density. ,,− By combining the passivation, the 2-dimensional (2D) perovskite, and other technologies with antisolvents, the PCE of EA-based PSCs has increased from 17.83 to 25.1%. ,,− , The IPA-based PSCs have also achieved impressive progress, whose PCE has been enhanced from 13.11% to the recent 26.07%. ,,− Moreover, considering the further optimization of the antisolvents in the nucleation and crystallization, the all-green mixed antisolvent strategy was developed and carried out.…”

“…18,20,42−44 By combining the passivation, the 2-dimensional (2D) perovskite, and other technologies with antisolvents, the PCE of EA-based PSCs has increased from 17.83 to 25.1%. 2,38,[41][42][43]48 The IPA-based PSCs have also achieved impressive progress, whose PCE has been enhanced from 13.11% to the recent 26.07%. 4,7,30−35 Moreover, considering the further optimization of the antisolvents in the nucleation and crystallization, the allgreen mixed antisolvent strategy was developed and carried out.…”