Electrochromic properties of Mo-doped V₂O₅ thin films deposited by spray pyrolysis process

Abstract

In this work, we have studied the Mo effect on V2O5 thin films, the samples were deposited by spray pyrolysis technique on heated glass substrates at 500 °C. The dopant amount was varied at different concentration, 2%, 4% and 6%. Different techniques were carried out, in order to studied the Mo effect on V2O5, such as XRD, Raman, SEM, AFM and electrochemical analysis. From the obtained results, all the samples exhibited orthorhombic structure with (001) predominant orientation. The optical properties of Mo concentration effect were studied in their colored and discolored states. These electrochemical studies were performed in LiClO4 electrolyte with 0.5 mol/L of C4H6O3. The transmittance value of the samples decreased from 76% to 10% at 690 nm, when the samples have changed color, from colored state to discolored state respectively.

Film Deposition of Electrochromic Metal Oxides through Spray Coating: A Descriptive Review

“…The same group then developed ~300 nm thick mixed layers of V 2 O 5 and MoO 3 [164] or WO 3 [166] being (pulsed) spray pyrolyzed at 400 • C from VCl 3 solutions, leading to VIS contrasts of 7 to 25%, switching times of ~10 s, and CE values of 15 to 35 cm 2 /C (V 2 O 5 -MoO 3 ) or 49 cm 2 /C (V 2 O 5 -WO 3 ), being stable up to 1000 cycles (Figure 14). Other teams considered similar strategies [167][168][169][170][171][172][173][174][175][176][177] as well as doping approaches with aliovalent elements such as S [178], F [179], Li [180], In [181], and Mo [182]; in the latter case, the incorporation of 4% at. MoCl 6 powder into the VCl 3 aqueous precursor solution led to noticeably high values of VIS ∆T (67%) and CE (80 cm 2 /C) in comparison with undoped and other doped (2, 6% at.)…”

“…MoCl 6 powder into the VCl 3 aqueous precursor solution led to noticeably high values of VIS ∆T (67%) and CE (80 cm 2 /C) in comparison with undoped and other doped (2, 6% at.) formulations [182]. More recently, V 2 O 5 formulations hybridized with carbon-based materials led to interesting EC properties [183][184][185][186], in some cases being significantly enhanced with respect to the state-of-the-art: these notably involved metalorganic-frameworks (MOFs) containing vanadium (V) sprayed at RT to 50 • C, resulting in highly functional layers with a VIS ∆T of 46 to 55%, a mean response time of 1 to 3 s, a CE of 89 to 109 cm 2 /C, and 81 to 96% of optical retention after several thousands of cycles [184,185].…”

Study of the Mn2+ ions influence in the deposition electrolyte on the electrochromic properties of obtained Ni(OH)2 films

“…Modification of crystal lattice can be achieved with the introduction of relatively small quantities of dopant [18,19]. Hydroxide materials can be modified by introducing significant amounts of metal ions [20,21].…”

Advanced materials for energy harvesting, storage, sensing and environmental engineering

“…The present edition is a continuation of the three previous 2016, 2017 and 2018 editions [1][2][3]. It practically includes works on similar themes such as energy transfer and storage [4][5][6], materials for energy and photonics [7][8][9][10], solar thermal and photovoltaic [11,12]. The theme of sensors and the thermal and vibration energy harvesting using piezoelectric and pyroelectric effects received a particular attention [13][14][15].…”