Chlorine capped SnO2 quantum-dots modified TiO2 electron selective layer to enhance the performance of planar perovskite solar cells

Abstract

A low-temperature TiO 2 /SnO 2 electron transport layer for high-performance planar perovskite solar cells SCIENCE CHINA Materials 63, 207 (2020); TiO2 nanoparticle-based electron transport layer with improved wettability for efficient planar-heterojunction perovskite solar cell

Toward High-Performance Electron/Hole-Transporting-Layer-Free, Self-Powered CsPbIBr2 Photodetectors via Interfacial Engineering

“…For example, under a bias voltage of 0 V, the PD without PEI modification yields the dark current of 2.20 × 10 –7 A, and the one containing TiO 2 ETL exhibits a decreased value of 4.69 × 10 –8 A, while it is reduced significantly to 2.03 × 10 –9 A for the one with PEI modification. A low dark current usually means a small shot noise and a low thermal noise, which are important to realize high-sensitivity self-powered PDs. , Primarily, the greatly decreased dark current densities under small bias voltages for the PD fabricated with PEI modification can be mainly attributed to the reduced work function of the FTO substrate, which is conductive to prevent the backflow of electrons from FTO to CsPbIBr 2 film and extend the space-charge region of the PD. , In addition, the reduced defects of the upper CsPbIBr 2 film could alleviate the trap-assisted recombination in the space-charge region of the PD, which is also in favor of reduced dark current densities . EQE spectra of all concerned PDs are shown in Figure e.…”

“…16,54 Primarily, the greatly decreased dark current densities under small bias voltages for the PD fabricated with PEI modification can be mainly attributed to the reduced work function of the FTO substrate, which is conductive to prevent the backflow of electrons from FTO to CsPbIBr 2 film and extend the spacecharge region of the PD. 55,56 In addition, the reduced defects of the upper CsPbIBr 2 film could alleviate the trap-assisted recombination in the space-charge region of the PD, which is also in favor of reduced dark current densities. 57 EQE spectra of all concerned PDs are shown in Figure 4e.…”

Hollow TiO2 Microsphere/Graphene Composite Photocatalyst for CO2 Photoreduction

“…Strategies to improve the photocatalytic performance of anatase TiO 2 commonly involve incorporating it into various materials or implementing nanoporosity [5,12,14,15]. Some of these methods include heteroatom doping [15][16][17], quantum dot decoration [18], additional semiconductor hybridization [19], and dye sensitization [20]. As these methods combine photocatalysts with sophisticated materials, coupling them with a simpler material, such as graphene, is a more straightforward approach.…”

Improved Performance of Planar Perovskite Solar Cells Using an Amino-Terminated Multifunctional Fullerene Derivative as the Passivation Layer

“…Apart from exploring alternative ETLs other than TiO 2 with lower defect densities, such as SnO 2 , − passivation methods have also been proposed to tackle this issue in TiO 2 -based PSCs. − Giordano et al reduced the electronic defect trap states of the mesoporous TiO 2 layer by the lithium dopant, resulting in PSCs with an enhanced open-circuit voltage ( V oc ) and negligible hysteresis. Materials with high electron mobility, such as self-assembled fullerene derivatives, pyridine, or other semiconductors, have been reported for the passivation of the TiO 2 surface. , Since fullerene C60 possesses high electron affinity for fast electron transfer, Yang et al introduced a triblock fullerene derivative PCBB-2CN-2C8 as a cathode modification layer on TiO 2 and significantly improved the PV performance and reduced the hysteresis.…”