An efficient electron transport material of tin oxide for planar structure perovskite solar cells

Abstract

The photovoltaic performance of a perovskite solar cell based on a new electron conducting SnO2 film prepared at low temperature using different solvents was investigated.SnO2 was selected as an electron conducting medium due to its superior properties over TiO2, such as better antireflective properties, higher electron mobility, more suitable band edges and a wider band gap. A SnO2 layer was developed by spin-coating SnCl2 solution followed by annealing at 200°C in air. The low-temperature (200 °C) annealed SnO2 layer exhibits enhanced crystallization, high transmittance, and uniform surface morphology using ethanol as a solvent rather than water. Solid state CuSCN hole conductor was used as HTM for reducing the device cost. A planar solar cell fabricated with CH3NH3PbI3 perovskite infiltrated SnO2 showed a power conversion efficiency of 8.38% with short-circuit current density of 18.99 mA/cm 2 , an open-circuit voltage of 0.96 mV and a fill factor of 45%. The devices were fabricated at >60% humidity level at room temperature. The results suggest that SnO2 is an effective charge collection system for CH3NH3PbI3 based planar perovskite solar cells. In addition, these results © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 provide a new direction for the future improvement of perovskite solar cells using new electron conducting layers.

Less is More: Dopant‐Free Hole Transporting Materials for High‐Efficiency Perovskite Solar Cells

“…Soon after the report of CuI based HTM, another dopant-free inorganic p-type HTM, CuSCN, was deposited in CH 3 NH 3 PbI 3 -based solar cells by the doctorblading technique with propyl sulfide as solvent. [40] It is worth noting that compared with typical organic HTMs, CuSCN Figure 1. [39] Two years later, this number was refreshed to 18% by Jung et al due to the adoption of compositionally engineered perovskite ( Figure 4b).…”

SnO2-based electron transporting layer materials for perovskite solar cells: A review of recent progress

“…In 2016, Murugadoss et al used water and ethanol as solvents and tin chloride (SnCl 2 ) as a precursor [106] . The compact SnO 2 was spin-coated onto an FTO substrate and then annealed at 200 °C for 1 h, creating a full cover and smooth SnO 2 film in ethanol [106] . Their PSC devices achieved a maximum PCE of 8.38% with ethanol solvent ( Fig.…”

Highly Compact TiO2 Films by Spray Pyrolysis and Application in Perovskite Solar Cells

“…The large amount of data available on perovskite absorber materials suggests that an increase in the performance of the electron transfer material (ETM) may lead to higher PCE and improved stability and can also reduce the hysteretic behavior in PSCs which describes the mismatch of the J – V curves depending on the voltage sweep direction decreasing the averaged power output . Several materials have been tested as ETMs, including TiO 2 , SnO 2 , ZnO, and WO 3 . The ETM often consists of a bilayer constituted by a compact (c‐TiO 2 ) and mesoporous titania (m‐TiO 2 ) junctions engineered to reduce hysteresis and improve charge transfer .…”