Light Trapping of Inclined Si Nanowires for Efficient Inorganic/Organic Hybrid Solar Cells

Abstract

Light/matter interaction of low-dimensional silicon (Si) strongly correlated with its geometrical features, which resulted in being highly critical for the practical development of Si-based photovoltaic applications. Yet, orientation modulation together with apt control over the size and spacing of aligned Si nanowire (SiNW) arrays remained rather challenging. Here, we demonstrated that the transition of formed SiNWs with controlled diameters and spacing from the crystallographically preferred <100> to <110> orientation was realized through the facile adjustment of etchant compositions. The underlying mechanism was found to correlate with the competing reactions between the formation and removal of oxide at Ag/Si interfaces that could be readily tailored through the concentration ratio of HF to H2O2. By employing inclined SiNWs for the construction of hybrid solar cells, the improved cell performances compared with conventional vertical-SiNW-based hybrid cells were demonstrated, showing the conversion efficiency of 12.23%, approximately 1.12 times higher than that of vertical-SiNW-based hybrid solar cells. These were numerically and experimentally interpreted by the involvement of excellent light-trapping effects covering the wide-angle light illuminations of inclined SiNWs, which paved the potential design for next-generation optoelectronic devices.

Mediation of Interfacial Mo2C Bridging Effect in MoS2@Carbon Colloid Dots Featuring Improved Photovoltaic Performances of Si‐Based Hybrid Solar Cells

“…Exceptionally, the pristine PEDOT:PSS essentially exists a single decay phenomenon (𝜏 1 = 1.20 ns) arising from the quenching of free carriers normally at the polymer surfaces, [37] whereas the second decay dynamics (𝜏 2 = 7.17 ns) may be taken place at PEDOT:PSS/SiNW interfaces. [53] It has been reported that fewlayer MoS 2 sheets exhibit the emission decays arising from distinct pathways, including non-radiative decays such as Auger or Shockley-Read-Hall recombination, and radiatively band-to-band recombination, [54,55] representing different decay dynamics in terms of 𝜏 1 and 𝜏 2 , respectively, accordingly to the conceptually fitting curve presented as below,…”

Improving Photovoltaic Technology by Nanomaterials: a Brief Review

“…4(d)-(f)) [19]. SiNWs have excellent antireflection properties, and using them on top of textured Si surfaces was shown to reduce the reflectance from ~13% to less than 1% [20].…”

Mediation of Interface Dipoles on SiOx/Si Nanowire Based Inorganic/Organic Hybrid Photodetectors with Enhanced Wavelength‐Selective Sensing Performances

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Recent development toward realizing the visible photodetector has relied on the employment of low-dimensional Si through the effective absorption of visible lights on the basis of the lighttrapping effect. [5][6][7] In addition, heterojunction engineering was found to potentially overcome the fast charge recombination within Si nanostructures due to the intrinsic nature of the in-direct band gap. [8] For instance, Kim et.

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