Abstract
Organically modified silica (ORMOSIL)-coated dye-sensitized solar cells (DSSCs) with improved energy conversion efficiency are demonstrated. ORMOSIL-coated DSSC surfaces exhibit omnidirectional low reflectivity over a broad range of wavelengths (400–800 nm). The short-circuit current density (JSC) is enhanced up to 23% at normal incidence (θ=0 deg) as a result of ORMOSIL coating. In addition, JSC enhancement is even higher at larger angles of incidence; 84% enhancement was observed at θ=30 deg. Moreover, ORMOSIL coating is superhydrophobic with a contact angle of 155 deg.
Highlights
We demonstrate the integration of multilayer antireflective (MLAR) organically modified silica (ORMOSIL) coatings on the photoanode of a dye-sensitized solar cells (DSSCs) device
Superhydrophobic ORMOSIL aerogel thin films are reported as an effective route for large-area superhydrophobic AR layers
It is shown that this layer can significantly reduce the light loss, it enhances the efficiency of the solar cell
Summary
Dye-sensitized solar cells (DSSCs) have undergone a renaissance as lightweight, low-cost, and relatively high efficiency photovoltaics (PV) due to extensive improvements in materials, device design and fabrication technologies.[1,2] Intense research efforts mainly focused on synthesizing new organic dye molecules with higher absorptivity and materials as more efficient carrier transport layers.[3,4,5,6,7] Single layer antireflection (SLAR) coating is a common approach to increase the light absorption in different types of solar cells.[8,9,10,11] The use of silica micro/nanospheres,[12] bioinspired moth-eye shaped structures,[13] and other designs are examples of these coatings.[14,15] the SLAR coatings are optimized to decrease reflection losses in a relatively narrow spectral range and at incidence angles close to surface normal. To prepare antireflective and superhydrophobic surfaces, the roughness factor should be optimized; it must
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