Reduced graphene oxide embedded titanium dioxide nanocomposite as novel photoanode material in natural dye-sensitized solar cells

Ramamoorthy, R.; Karthika, K.; Dayana, A. Maggie; Maheswari, Govindaraj; Eswaramoorthi, V.; Pavithra, Nagaraj; Anandan, Sambandam; Williams, R. Victor

doi:10.1007/s10854-017-7211-0

Cited by 20 publications

(27 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the edges and crumpled silk waves of these carbon sheets suggest that these nanoparticles are indeed deposited on the RGO sheet 53 . Interaction between the TiO 2 nanoparticles and the RGO sheet led to the formation of the nanocomposite via the formation of TiOC bonds between the interacting species, as is evident in the FTIR spectra (Figure 6) 54 …”

Section: Resultsmentioning

confidence: 87%

“…53 Interaction between the TiO 2 nanoparticles and the RGO sheet led to the formation of the nanocomposite via the formation of Ti O C bonds between the interacting species, as is evident in the FTIR spectra ( Figure 6). 54 The TEM image in Figure S2 further reveals that the three-dimensional structure of RGO was retained and the inherent wrinkled surface is kept. RGOT exhibits good interaction between the RGO sheet and TiO 2 .…”

Section: Surface and Textural Characteristicsmentioning

confidence: 88%

“…This implies that the RGO sheet was retained to afford the dispersion of titania on its surface. 37 Meanwhile, a noticeable anatase TiO 2 phase was observed in the diffractogram presented in Figure 6B Figure 6C-G, respectively. 46 These observed peaks of anatase TiO 2 were maintained after TiO 2 was deposited on the RGO nanosheet.…”

Section: Phase Compositionmentioning

confidence: 89%

“…77 Also, the red shift observed in the RGOT nanocomposites may be attributed to the inherent bandgap absorption of TiO 2 originating from the electronic transitions from the valence band (O 2p ) to the conduction band (Ti 3d ). 54,74 This occurrence can narrow the bandgap of TiO 2 due to the presence of RGO. 78 Thus, the introduction of RGO helps to significantly reduce or modulate the bandgap and therefore its optoelectronic properties.…”

Section: Optoelectronic Transition Studiesmentioning

confidence: 99%

“…Also, studies have shown that the introduction of graphene-based nanomaterials in the TiO 2 layer aids in improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). 19,36 For example, Ramamoorthy et al 37 reported that inserting RGO in TiO 2 led to increased electron transport and an enhanced PCE of 0.47% to 0.57% in natural DSSCs. Lim et al 38 also demonstrated the influence of RGO in RGO-TiO 2 nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

2020

View full text Add to dashboard Cite

Lately, there has been increased interest in the design of graphene-based hybrid nanomaterials and their application to modify properties of organic solar cells (OSCs). Herein, we demonstrate an efficient route for the successful hydrothermal synthesis of reduced graphene oxide-anatase titania (RGOT) nanocomposites. Five nanocomposites with different titania concentrations, that is, RGOT-50, RGOT-75, RGOT-86, RGOT-90, and RGOT-92, were prepared. The nanocomposite RGOT-92 with the overall best properties was used to modify both the photoactive layer (P3HT:PCBM:RGOT) and hole transport layer (PEDOT:PSS:RGOT) of an OSC so as to assist in solar energy absorption by way of enhancing optical absorption and creating an efficient charge transport channel. The nanocomposites prepared consist of highly crystalline, spherical, and uniformly shaped TiO 2 nanoparticles, with an average particle size of approximately 3.0 nm, deposited on the basal plane of reduced graphene oxide. Also, the nanocomposites show much reduced bandgap energies and low rates of electron-hole recombination. The incorporation of RGOT in the active layer effectively improved photon absorption, leading to high photoexciton generation. In addition, effective exciton dissociation was energetically favoured in the RGOT-modified hole transport layer (HTL), which concurs with the observed enhanced conductivity of the medium. Thus, the integration of RGOT in the active layer and HTL remarkably resulted in a high short-circuit current density (J sc), low sheet resistance (R s), and, consequently, improved photovoltaic performance. An enhanced photocurrent was noted, as high as 13 mA cm −2 , from the OSCs by inlaying RGOT in the photoactive layer. An increased power conversion efficiency of up to 64% was achieved by the incorporation of RGOT in the photoactive layer. Thus, the utilized hydrothermal synthesis route provided nanocomposites with enhanced photoelectronic properties, with promising applications in nanoelectronic devices.

show abstract

Section: Resultsmentioning

confidence: 87%

Section: Surface and Textural Characteristicsmentioning

confidence: 88%

Section: Phase Compositionmentioning

confidence: 89%

Section: Optoelectronic Transition Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

2020

View full text Add to dashboard Cite

show abstract

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Ngidi

Muchuweni

Nyamori

2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary The photoanode in a dye‐sensitised solar cell (DSSC) plays a crucial role in achieving a high power conversion efficiency (PCE). It supports the sensitiser and acts as a transporter of photo‐excited electrons from the sensitiser to the external circuit. These two functions are enhanced by a large surface area and a fast charge transport rate. Typically, the photoanode consists of titanium dioxide (TiO2) nanoparticles. If the nanoparticles are deposited on a carbonaceous substrate, it facilitates the transport of photogenerated electrons. This study compared the photoanode performance of boron‐ or nitrogen‐doped reduced graphene oxide (B‐ or N‐rGO) nanocomposites integrated with TiO2. All nanocomposites exhibited mainly the anatase TiO2 phase, and N‐rGO‐TiO2 exhibited the lowest bandgap of 2.1 eV, which was attributed to the formation of Ti‐O‐C and Ti‐O‐N bonds. Also, N‐rGO‐TiO2 displayed good charge carrier separation ability and electron transfer. The low TiO2 content in the nanocomposites led to the suppression of electron‐hole recombination, reduction in the bandgap energy and improvement in electron transport, resulting in higher current density. Two photo‐harvesting dyes (sensitisers) were investigated, that is, eosin B and Sudan II. A higher light‐harvesting efficiency was obtained from eosin B, indicating the presence of more dye molecules anchored onto the TiO2. Photoanodes fabricated from N‐rGO‐TiO2 and B‐rGO‐TiO2 showed enhanced photo‐exciton generation, higher short‐circuit current densities and significantly better PCEs of 3.94% and 2.55%, respectively, than their undoped rGO‐TiO2 counterparts (1.78%). This work demonstrates that heteroatom‐doped rGO‐TiO2‐based nanocomposites can improve the rate of transportation and collection of electrons, thereby enhancing the performance of DSSCs.

show abstract

Reduced graphene oxide modified titania photoanodes for fabrication of the efficient dye-sensitized solar cell

Ramamoorthy

Eswaramoorthi

Ubaidullah³

et al. 2019

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Reduced graphene oxide embedded titanium dioxide nanocomposite as novel photoanode material in natural dye-sensitized solar cells

Cited by 20 publications

References 63 publications

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Reduced graphene oxide modified titania photoanodes for fabrication of the efficient dye-sensitized solar cell

Contact Info

Product

Resources

About

Reduced graphene oxide embedded titanium dioxide nanocomposite as novel photoanode material in natural dye-sensitized solar cells

Cited by 20 publications

References 63 publications

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Hydrothermal synthesis of reduced graphene oxide‐anatase titania nanocomposites for dual application in organic solar cells

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO2‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Reduced graphene oxide modified titania photoanodes for fabrication of the efficient dye-sensitized solar cell

Contact Info

Product

Resources

About

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells