A facile room temperature solution synthesis of SnO₂quantum dots for perovskite solar cells

Abstract

We introduce a facile route to synthesize SnO2 quantum dots colloidal solution at room temperature and superior homogeneous ETL is obtained by spin coating of the QDs colloidal solution with post-deposition annealing.

Suppressing Interfacial Charge Recombination in Electron‐Transport‐Layer‐Free Perovskite Solar Cells to Give an Efficiency Exceeding 21 %

“…In addition, the commonly used metal oxide ETLs, such as TiO 2 and SnO 2 , require an energy‐consuming annealing process (>150 °C) to ensure good charge transport characteristic. All of aforementioned aspects would inevitably increase the complexity and cost of device production [6–11] . Other fascinating optoelectronic properties of these magic perovskite materials, for example, ambipolar charge transport capability, low exciton dissociation energy and long charge diffusion length, point to the great potential for constructing high‐performance, ETL‐free PSCs, which is thought to be a perfect solution to address the dilemma of balancing high efficiency and low production cost [12] .…”

Suppressing Interfacial Charge Recombination in Electron‐Transport‐Layer‐Free Perovskite Solar Cells to Give an Efficiency Exceeding 21 %

“…Theelectronic trap-state densities in the perovskite layer can be estimated by as pace-charge limited current (SCLC) measurement for the electron-only device with astructure of FTO/interlayer/perovskite/PCBM/Au, where the interlayer is a-NbOH or Nb 2 O 5 ,a nd PCBM is [6,6]-phenyl-C 61 -butyric acid methyl ester. [33] Figure 2f depicts the dark currentvoltage (I-V)curves of the corresponding devices.Ingeneral, the linear region at low bias represents the ohmic response, followed by at rap-filling process at high bias.…”

“…[4,5] In addition, the commonly used metal oxide ETLs,such as TiO 2 and SnO 2 ,r equire an energy-consuming annealing process (> 150 8 8C) to ensure good charge transport characteristic.All of aforementioned aspects would inevitably increase the complexity and cost of device production. [6][7][8][9][10][11] Other fascinating optoelectronic properties of these magic perovskite materials,for example,ambipolar charge transport capability, low exciton dissociation energy and long charge diffusion length, point to the great potential for constructing highperformance,ETL-free PSCs,which is thought to be aperfect solution to address the dilemma of balancing high efficiency and low production cost. [12] Owing to continuous research efforts to optimize the materials,interfaces,device structures and fabrication processes,t he power conversion efficiencies (PCEs) of state-of-the-art ETL-free PSCs already exceed 20 %, which is approaching the certified PCE as high as 25.2 %f or their ETL-containing counterpart.…”

Carbon‐Electrode Based Perovskite Solar Cells: Effect of Bulk Engineering and Interface Engineering on the Power Conversion Properties

“…It should be noted that there exists a large amount of efficient bulk/interface engineering strategies . These progresses are worthy to be carefully studied.…”