25.11% efficiency silicon heterojunction solar cell with low deposition rate intrinsic amorphous silicon buffer layers

Ru, Xiaoning; Qu, Mengnan; Wang, Jianqiang; Ruan, Tianyu; Yang, Miao; Peng, Fuguo; Wei, Long; Zheng, Kun; Yan, Hui; Xu, Xixiang

doi:10.1016/j.solmat.2020.110643

Cited by 140 publications

(119 citation statements)

References 43 publications

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Section: Carbon Nanotubes In Silicon Photovoltaicsmentioning

confidence: 75%

“…The high J sc was confirmed by EQE and its integrated current density curves, Figure 4b, which is close to the EQE level of the SHJ solar cells. [ 145 ] An FF of 82% surpasses all previous work for CNT‐Si heterojunction solar cells, while being a record for dopant‐free contact architectures, including hole‐selective MoO x and PEDOT based Si solar cells. [ 123c,146 ] We speculated that the high FF was related to the CNTs themselves and that it was a result of their higher carrier mobility.…”

Section: Carbon Nanotubes In Silicon Photovoltaicsmentioning

confidence: 99%

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Carbon Nanotubes for Photovoltaics: From Lab to Industry

Wieland

Han

Rust

et al. 2020

Advanced Energy Materials

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All other nanotube conformations (0° < θ < 30°) are referred to as being chiral. In this 1D system, circumferential electron confinement results in SWCNTs that are either metallic (m) or semiconducting (s) and the innate ability of small changes in diameter to impart large changes in the spectral position (size) of absorption maxima (bandgap) of the SWCNTs. [1a,2] For each chiral species these maxima appear as sets of discrete excitonic transitions (S 11 , S 22 , S 33 …etc.) in the infrared, visible, and ultraviolet and the ability to tune them with structure has made SWCNTs one of the most intensively studied nanomaterials of the past two decades. [3] SWCNTs meet all of the requirements for next generation technology to become flexible and potentially made entirely from carbon to aid disposal at the end of the product life-cycle. Applications for SWCNTs can be found across all fields of science including photonics, [4] telecommunications, [5] batteries, [6] fuel cells, [7] high frequency transistors, [8] biosensors, [9] novel memory devices, [10] molecular contacts, [11] and cancer research. [12] In particular, their chirality dependent bandgap, chemical stability, conductivity, and hole selectivity have made them attractive for new generation solar cells and light sensitive elements. [13] For example, there are 200 species in the dia meter range of 0.6-2 nm, which have first (S 11) and second (S 22) optical transitions ranging from 2.57 eV (visible) to 0.5 eV (near-infrared) and these already cover a majority of the solar spectrum (400-2000 nm), Figure 1d. [14] Being solutionprocessable and fiber-shaped, CNTs can easily be integrated into different types of solar cells with distinct functions. For example, as a photoactive layer in organic solar cell, a transparent electrode in silicon and perovskite solar cells or as counter electrode in dye-sensitized solar cells. [15] However, despite their promise, the number of real-world applications for SWCNTs in the photovoltaics (PV) industry continue to remain limited. The reasons for this are manifold and include the comparatively lower power conversion efficiency (PCE) and device area of SWCNT-based technologies, which drive simple cost-benefit arguments to retool existing production lines, ongoing challenges to orientate and control the structure of CNT films in a scalable manner, spurious health concerns associated with the use of CNTs [16] and importantly, the fact that it is still not possible to selectively synthesize SWCNTs of arbitrarily defined chirality. Most synthesis methods produce a 2:1 mixture of many semiconducting and metallic chiral types and even the CoMoCAT synthesis process, [17] which is well known to be highly enriched in small diameter (6,5), still contains at least 15 other chiral species in low concentration. Research efforts to achieve chiral specific growth are ongoing The use of carbon nanotubes (CNTs) in photovoltaics could have significant ramifications on the commercial solar cell market. Three interrelated research directions within t...

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Section: Carbon Nanotubes In Silicon Photovoltaicsmentioning

confidence: 75%

Section: Carbon Nanotubes In Silicon Photovoltaicsmentioning

confidence: 99%

Carbon Nanotubes for Photovoltaics: From Lab to Industry

Wieland

Han

Rust

et al. 2020

Advanced Energy Materials

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“…This is 0.6% higher than the best device using a thin silicon oxide passivating layer combined with poly-silicon contacts [5]. However, efficiency in both-side contacted heterojunction devices hovers at 25.1% [6], [7], whereas devices using a homojunction at the front side (and a passivating contact on the rear side) recently reached up to 26.0% efficiency [8]. This difference is principally due to a lower short-circuit current density (JSC) for the SHJ cell, notably due to parasitic absorption of short-wavelength light in the window-layer stack (i.e.…”

mentioning

confidence: 84%

“…layers deposited on the light-incoming side of the wafer) when employing a full-area passivating-contact design [9]. A highest efficiency of 25.1% was interestingly obtained with either a hole-selective [6] or electron-selective [7] contact placed on the light-incoming side.…”

mentioning

confidence: 99%

Hole-Selective Front Contact Stack Enabling 24.1%-Efficient Silicon Heterojunction Solar Cells

Boccard

Antognini

Paratte

et al. 2021

IEEE J. Photovoltaics

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The window-layer stack limits the efficiency of both-side-contacted silicon heterojunction solar cells. We discuss here the combination of several modifications to this stack to improve its optoelectronic performance. These include the introduction of a nanocrystalline silicon-oxide p-type layer in lieu of the amorphous silicon p-type layer, replacing indium tin oxide with a zirconium-doped indium oxide for the front transparent electrode, capping this layer with a silicon-oxide film, and applying a post-fabrication electrical biasing treatment. The influence of each of these alterations is discussed, as well as their interactions. Combining all of them finally enables the fabrication of a highly transparent and electrically well-performing windowlayer stack, leading to a screen-printed silicon heterojunction solar cell with 24.1% efficiency. Paths towards industrialization and for further improvements are finally discussed.

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“…[ 1 ] Recently, Hanergy demonstrated a new bifacial SHJ record with certified efficiency of 25.11% from one side illumination. [ 2 ] The impressive 84.98% fill factor (FF) has eliminated the fears that SHJ solar cell could not reach high FFs. [ 3,4 ] However, the short‐circuit current density ( J sc ) of 39.55 mA cm −2 was much lower compared with the other two sides contacted silicon champion solar cells, like passivated emitter and rear contact cell or tunnel oxide passivated contacted solar cell, which have a J sc above 40 mA cm −2 .…”

Section: Introductionmentioning

confidence: 99%

Improved Infrared Light Management with Transparent Conductive Oxide/Amorphous Silicon Back Reflector in High‐Efficiency Silicon Heterojunction Solar Cells

et al. 2021

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To improve the infrared (IR) response, a high‐refractive‐index intrinsic amorphous silicon (a‐Si:H) layer is introduced after metallization of bifacial silicon heterojunction (SHJ) solar cells, resulting in a transparent conductive oxide (TCO)/a‐Si:H back reflector, which functions like distributed Bragg reflector (DBR). This concept is demonstrated by both Sentaurus Technology Computer‐Aided Design (TCAD) simulation and experimental methods. The TCO/a‐Si:H back reflector can increase rear internal reflectance by reducing the transmission loss, thus improving the IR external quantum efficiency. The using of Sn‐doped In2O3 (ITO)/a‐Si:H back reflector in >23.5% efficiency SHJ solar cells can improve short‐circuit current density by 0.4 mA cm−2 which is quite similar as using the more expensive ITO/Ag back reflector, while keeping a cell bifaciality of 55%. This brings its advantage for monofacial application case. Future studies would be nice to work on higher transparent back reflectors to broaden the application in bifacial case. This back‐reflector design promotes IR response of SHJ solar cells with transferring to a wide variety of TCOs.

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25.11% efficiency silicon heterojunction solar cell with low deposition rate intrinsic amorphous silicon buffer layers

Cited by 140 publications

References 43 publications

Carbon Nanotubes for Photovoltaics: From Lab to Industry

Carbon Nanotubes for Photovoltaics: From Lab to Industry

Hole-Selective Front Contact Stack Enabling 24.1%-Efficient Silicon Heterojunction Solar Cells

Improved Infrared Light Management with Transparent Conductive Oxide/Amorphous Silicon Back Reflector in High‐Efficiency Silicon Heterojunction Solar Cells

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