Efficient planar perovskite solar cells based on low-cost spin-coated ultrathin Nb2O5 films

Gu, Bangkai; Zhu, Yayun; Lü, Hao; Tian, Wei; Li, Liang

doi:10.1016/j.solener.2018.03.054

Cited by 25 publications

(12 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, the change in transmittance Δ T = 0.15 and 0.41 at λ = 500 and 900 nm, respectively, was reduced relative to the uncoated WO 2.72 control (Δ T = 0.20 and 0.49 at λ = 500 and 900 nm, respectively). Altogether, these results suggest that although amorphous Nb 2 O 5 is a less efficient coating for reducing unwanted photochromic effects than amorphous Ta 2 O 5 , likely due to the deeper valence band maximum of the latter relative to that of WO 3 , , it is a promising alternative material that could be even more viable after further optimization.…”

Section: Resultsmentioning

confidence: 99%

Direct Electrochemical Deposition of Transparent Metal Oxide Thin Films from Polyoxometalates

et al. 2020

View full text Add to dashboard Cite

Transition metal oxide coatings, owing to their unique combination of optoelectronic, electrochemical, and chemical properties, are at the forefront of functional thin films across diverse technologies. However, achieving uniform and conformal metal oxide thin films of precise nanoscale thickness and optical quality is largely limited to atomic layer deposition methods. Here, we report a direct, fast, solution-based, ambient-condition electrochemical method to deposit transparent thin films of amorphous niobium oxide and tantalum oxide from polyoxometalate precursors dissolved in aqueous electrolytes. The acid-catalyzed condensation of the polyoxometalates is driven by the potentiostatic oxidation of water at the surface of the transparent working electrode. Film thickness can be tuned at the nanoscale by varying the applied potential. We deposited niobium oxide and tantalum oxide conformally on mesoporous nanocrystal films to demonstrate the abilities of this electrochemical method as an alternative approach to fabricate optical quality composites. These composites exhibit electrochromic and antiphotochromic performance comparable to that of the equivalent composites fabricated by established conventional methods such as atomic layer deposition.

show abstract

Section: Resultsmentioning

confidence: 99%

Direct Electrochemical Deposition of Transparent Metal Oxide Thin Films from Polyoxometalates

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The clear arc correlates with the recombination of charge carrier at the surface of the perovskite, reflecting the recombination resistance R rec . [38][39][40] It is observed that a larger R rec is achieved by the device with double passivation compared with the control device, which reveals that the device with double passivation has a lower recombination rate, which means that PEABr and PbI 2 in the grain boundary have effectively passivated the traps.…”

Section: Resultsmentioning

confidence: 99%

A Modulated Double‐Passivation Strategy Toward Highly Efficient Perovskite Solar Cells with Efficiency Over 21%

et al. 2019

View full text Add to dashboard Cite

Material passivation is essential to enhance the quality of perovskite materials and boost the performance of perovskite solar cells (PSCs). However, most of the previous reports only paid attention to improving the quality of perovskite films by adopting single passivation. Here, a facile strategy that can carry out double passivation to improve the performance of PSCs is demonstrated. By using the dilute halide salt PEABr solution to treat the perovskite film, PbI 2 can precipitate from the perovskite. Both PEABr and PbI 2 can passivate the perovskite film, and by combining PEABr and PbI 2 , the double passivation improves the performance of PSCs significantly. Very high short-circuit current density of 24.30 mA cm À2 , open-circuit voltage of 1.10 V, and fill factor of 79.75% are achieved which lead to a surprising efficiency of 21.32% for the passivated device. The improved efficiency is mainly according to the available surface passivation of the perovskite material, leading to repressed nonradiative recombination and unhindered charge collection. In addition, the passivated device exhibits better power conversion efficiency stability relative to the control device.

show abstract

“…Niobium pentoxide (Nb 2 O 5 ) is a promising material to be used as ETL in perovskite solar cells due to its high stability. In our previous work, we found that the combination of compact Nb 2 O 5 as hole blocking layer and TiO 2 mesoporous produces more stable devices with less hysteresis (Fernandes et al, 2016; Gu et al, 2018). In addition, the band gap value of Nb 2 O 5 could improve the V oc of the cells (Kogo et al, 2015).…”

Section: Introductionmentioning

confidence: 98%

Exploring the Properties of Niobium Oxide Films for Electron Transport Layers in Perovskite Solar Cells

et al. 2019

View full text Add to dashboard Cite

In this work, niobium oxide films were deposited by reactive magnetron sputtering under different oxygen flow rate and applied as electron transport layer in perovskite solar cells. It was found that the deposition made using 3.5 sccm of oxygen flow resulted in films with better electrical properties which helped the extraction of the photogenerated electrons to the external circuit, improving the Jsc and consequently the device efficiency. In addition, by photoluminescence measurements, we found a better charge transfer from perovskite to TiO2/niobium oxide film deposited at 3.5 sccm of oxygen flow.

show abstract

Efficient planar perovskite solar cells based on low-cost spin-coated ultrathin Nb2O5 films

Cited by 25 publications

References 36 publications

Direct Electrochemical Deposition of Transparent Metal Oxide Thin Films from Polyoxometalates

Direct Electrochemical Deposition of Transparent Metal Oxide Thin Films from Polyoxometalates

A Modulated Double‐Passivation Strategy Toward Highly Efficient Perovskite Solar Cells with Efficiency Over 21%

Exploring the Properties of Niobium Oxide Films for Electron Transport Layers in Perovskite Solar Cells

Contact Info

Product

Resources

About