Nanostructured Silicon Used for Flexible and Mobile Electricity Generation

Sun, Baoquan; Shao, Mingwang; Lee, Shui-Tong

doi:10.1002/adma.201601012

Cited by 40 publications

(26 citation statements)

References 70 publications

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“…However, it is noted that the hierarchical Sb 2 Te 3 pillar array and the Bi 2 (Te,Se) 3 nanowire array are grown perpendicular to the substrates and possess relatively high densities of interspaces, which degrade the in-plane transport properties to some extent. Stranz and Sun reported that a wafer-scale vertical nanopillar arrays or nanowire arrays can be realized by lithography and anisotropic etching for improving the performance of TE cross-plane devices as proposed recently 17 , 18 . But it is hardly to overcome a problem of carrier and phonon transport along the in-plane direction and measure cross-plane TE properties for vertical nanopillar arrays or nanowire arrays films.…”

Section: Introductionmentioning

confidence: 99%

Tilt-structure and high-performance of hierarchical Bi1.5Sb0.5Te3 nanopillar arrays

Tan

Hao

Deng

et al. 2018

Sci Rep

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The uniquely tilted nanopillar array favorably influence carrier and phonon transport properties. We present an innovative interfacial design concept and a novel tilt-structure of hierarchical Bi1.5Sb0.5Te3 nanopillar array comprising unique interfaces from nano-scaled open gaps to coherent grain boundaries, and tilted nanopillars assembled by high-quality nanowires with well oriented growth, utilizing a simple vacuum thermal evaporation technique. The unusual structure Bi1.5Sb0.5Te3 nanopillar array with a tilt angle of 45° exhibits a high thermoelectric performance ZT = 1.61 at room temperature. The relatively high ZT value in contrast to that of previously reported Bi1.5Sb0.5Te3 materials and the Bi1.5Sb0.5Te3 nanopillar array with a tilt angle of 60° or 90° evidently reveals the crucial role of the unique interface and tilt-structure in favorably influencing carrier and phonon transport properties, resulting in a significantly improved ZT value. This method opens a new approach to optimize nano-structure film materials.

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Section: Introductionmentioning

confidence: 99%

Tilt-structure and high-performance of hierarchical Bi1.5Sb0.5Te3 nanopillar arrays

Tan

Hao

Deng

et al. 2018

Sci Rep

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“…Organic/silicon (Si) heterojunction solar cell has been widely investigated since it can potentially combine the advantage of the excellent optoelectronic properties of Si and the easy processable characteristics of organic conjugated molecules . It may also generate an alternative to obtain devices that are stable and present higher power output per unit weight .…”

Section: Electrical Output Characteristics Of the Devices With Optimimentioning

confidence: 99%

Doping‐Free Asymmetrical Silicon Heterocontact Achieved by Integrating Conjugated Molecules for High Efficient Solar Cell

Liu

et al. 2017

Advanced Energy Materials

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Organic conjugated molecule/silicon (Si) heterojunction has been widely investigated to build up an asymmetrical heterocontact for efficient photovoltaics. However, it is still unclear how the organic molecular structures can affect their electronic coupling interaction with Si. Here, two widely explored electron acceptors of poly{[N,N′‐bis(2‐octyldodecyl)‐naphthalene‐1,4,5,8‐bis(dicarboximide)‐2,6‐diyl]‐alt‐5,5′‐(2,2′‐bithiophene)} (N2200) and [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) are used to build up asymmetrical Si heterocontact to investigate their electronic coupling interaction. It is found that PCBM displays different electronic coupling with Si from N2200, which is ascribed to their various physical distance with Si based on a systematic and detailed density functional theory calculation. Organic layer incorporation not only suppresses the surface charge recombination velocity but also leads to an Ohmic contact between Si and Al. Therefore, a doping‐free organic/Si heterojunction photovoltaic with a power conversion efficiency of 14.9% is achieved with PCBM layer. This work discloses a key factor affecting organic/Si electronic coupling interaction, which helps build up high quality Si heterocontact for solar cells and other optoelectronic devices. Furthermore, the simplified heterocontact achieved by a low temperature, solution processed, and lithography‐free steps has a dramatic improvement on conventional diffusion doped‐silicon one at high temperature.

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“…Organic/c‐Si hybrid heterojunctions comprising a silicon‐based absorber and an organic carrier‐selective functional layer are promising materials for manufacturing low‐cost fabrication and high power conversion efficiency (PCE) next‐generation photovoltaic (PV) cells, because of the many unique properties of c‐Si and simple device structure . Nonetheless, organic semiconductors associated with nonideal interfacial contacts and low electrical conductivity can considerably impede the improvement of device performance for planar heterojunction solar cells.…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive and Wettable PEDOT:PSS for Simple and Efficient Organic/c‐Si Planar Heterojunction Solar Cells

Chen

Feng

et al. 2020

Solar RRL

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The key for fabricating efficient organic/n‐Si planar heterojunction solar cells is the organic semiconductor layer, which governs key steps in photocarrier harvesting such as charge carrier separation and extraction. Typical organic semiconductors, however, are inadequate to yield good device performance due to their low electrical conductivities and undesirable work functions. Herein, a method is proposed to boost charge carrier concentration in poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) from 1018 to 1022 cm−3 by combining solvent p‐doping and DMF treatment. This high carrier concentration induces significant band bending in the Si substrate and thus leads to an extended inversion zone near an organic/Si heterojunction. It is found that this type of heterojunction creates a broad built‐in electric field and effective interface passivation. The highly conductive PEDOT:PSS enables a simple and efficient organic/n‐Si planar heterojunction solar cell with a power conversion efficiency exceeding 13% without using complex light‐trapping structures. This power efficiency is comparable with the highest value reported to date. Herein, the possibility of making effective organic/n‐Si planar heterojunction solar cells simply by applying a layer of extremely conductive organic coating is demonstrated.

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Nanostructured Silicon Used for Flexible and Mobile Electricity Generation

Cited by 40 publications

References 70 publications

Tilt-structure and high-performance of hierarchical Bi1.5Sb0.5Te3 nanopillar arrays

Tilt-structure and high-performance of hierarchical Bi1.5Sb0.5Te3 nanopillar arrays

Doping‐Free Asymmetrical Silicon Heterocontact Achieved by Integrating Conjugated Molecules for High Efficient Solar Cell

Highly Conductive and Wettable PEDOT:PSS for Simple and Efficient Organic/c‐Si Planar Heterojunction Solar Cells

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