Three-dimensional graphene networks and reduced graphene oxide nanosheets co-modified dye-sensitized solar cells

Abstract

Graphene assisted dye-sensitized solar cells (DSSCs) have drawn increasing attention because of their high performances.

Graphene based photoanode for DSSCs with high performances

“…The type of terminal layer has a vital role in the determination of the resulting properties and explains the discrepancy from previous reports. 9,21 Moreover, the observed photovoltaic performances from J-V curves show that the presence of the RGO in the work layer has a positive inuence on the devices. Our group has proven that the interface contact level between the graphene basal plane and TiO 2 nano-particles in the work layer is quite important to the resulting photovoltaic performances.…”

“…19 Considering the negative inuence from the discontinuous construction of the RGO nanosheets on the electron transport, three-dimensional graphene networks (3DGNs) prepared by chemical vapor deposition method were used in the photoanode as fast electron transport channels by our group. 20,21 Although the h increases to 9.1% ($30% higher than that of the RGO added device), it is still far from the predicted value. Aer careful analysis, we found that the poor interface contact between the 3DGNs and TiO 2 sets a barrier to the electron transport, leading to a remarkable loss of the photocurrent.…”

“…22 However, in some cases, we found that the added transport layer may not play an expected effect, indicating that some other factors inuence the function of the transport layer. 21 Based on our recent study, the interface condition between the graphene and TiO 2 is found to exert a signicant inuence on the electron and phonon transport between them. The surface defect of the 3DGNs can act as the bridge to achieve ohmic contact between them.…”

“…Aer careful analysis, we found that the poor interface contact between the 3DGNs and TiO 2 sets a barrier to the electron transport, leading to a remarkable loss of the photocurrent. 21 As we know, the poor contact between the conductive substrate and photoanode brings about a high dark current, leading to a reduced short circuit current (J SC ) and h. 9,20 Recently, our group designed a series of photoanodes with a two-layer structure to depress the annihilation of photogenerated electrons and I 3…”

High Performance Composite Photocatalysts based on Metal Organic Framework as the Modifier

“…IR curves of the TiO 2 , RGO, Cu‐BTC, RGO/TiO 2 , Cu‐BTC‐RGO/TiO 2 and Cu‐BTC‐RGO‐TiO 2 are listed in Figure . The skeletal vibration of carbon atoms generates the fingerprint peak of graphene (1600 cm –1 ), while the signal located at 3000–3700 cm –1 is induced by the adsorbed water (O–H stretching vibration) . After incorporating TiO 2 and RGO, the signal located at low frequency area (ca.…”