Optical analysis of perovskite/silicon tandem solar cells

Jiang, Yajie; Almansouri, Ibraheem; Huang, Shujuan; Young, Trevor L.; Li, Yang; Peng, Yong; Hou, Qicheng; Spiccia, Leone; Bach, Udo; Cheng, Yi‐Bing; Green, Martin A.; Ho‐Baillie, Anita

doi:10.1039/c6tc01276k

Cited by 117 publications

(96 citation statements)

References 37 publications

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“…4,31 Parasitic absorption of short wavelength light also exists in the ITO/MoO 3 stack, which is also the most commonly used transparent conductive stack for the top of the semi-transparent perovskite in a tandem. 17,32 The thin MoO 3 protects the perovskite cell from sputter damage from the deposition of ITO, which is responsible for electrical conduction. Absorption in the ITO/MoO 3 /HTM stack hinders the effectiveness of the use of the high bandgap perovskite.…”

Section: Approachmentioning

confidence: 99%

Large area efficient interface layer free monolithic perovskite/homo-junction-silicon tandem solar cell with over 20% efficiency

Zheng

Lau

Mehrvarz

et al. 2018

Energy Environ. Sci.

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197

186

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aMonolithic perovskite/silicon tandem solar cells show great promise for further efficiency enhancement for current silicon photovoltaic technology. In general, an interface (tunnelling or recombination) layer is usually required for electrical contact between the top and the bottom cells, which incurs higher fabrication costs and parasitic absorption. Most of the monolithic perovskite/Si tandem cells demonstrated use a hetero-junction silicon (Si) solar cell as the bottom cell, on small areas only. This work is the first to successfully integrate a low temperature processed (r150 1C) planar CH 3 NH 3 PbI 3 perovskite solar cell on a homo-junction silicon solar cell to achieve a monolithic tandem without the use of an additional interface layer on large areas (4 and 16 cm 2 ).Solution processed SnO 2 has been effective in providing dual functions in the monolithic tandem, serving as an ETL for the perovskite cell and as a recombination contact with the n-type silicon homo-junction solar cell that has a boron doped p-type (p++) front emitter. The SnO 2 /p++ Si interface is characterised in this work and the dominant transport mechanism is simulated using Sentaurus technology computer-aided design (TCAD) modelling. The champion device on 4 cm 2 achieves a power conversion efficiency (PCE) of 21.0% under reverse-scanning with a V OC of 1.68 V, a J SC of 16.1 mA cm À2 and a high FF of 78% yielding a steady-state efficiency of 20.5%. As our monolithic tandem device does not rely on the SnO 2 for lateral conduction, which is managed by the p++ emitter, up scaling to large areas becomes relatively straightforward. On a large area of 16 cm 2 , a reverse scan PCE of 17.6% and a steady-state PCE of 17.1% are achieved. To our knowledge, these are the most efficient perovskite/homo-junction-silicon tandem solar cells that are larger than 1 cm 2 . Most importantly, our results demonstrate for the first time that monolithic perovskite/silicon tandem solar cells can be achieved with excellent performance without the need for an additional interface layer. This work is relevant to the commercialisation of efficient large-area perovskite/homo-junction silicon tandem solar cells. Broader contextA simple approach for integrating a perovskite solar cell monolithically onto a Si solar cell is reported here. The first advantage of this approach is that it does not require additional fabrication of an additional interface layer between the perovskite and Si cell. The second advantage of this approach is that it is compatible with a homo-junction p-n Si solar cell, which is a common Si solar cell structure for commercial cells. The third advantage is that the entire sequence for the planar perovskite cell fabrication is done at low temperatures, minimising damage to the bottom Si solar cell. The fourth advantage is that the SnO 2 electron transport layer of the perovskite top cell also serves as a recombination contact with the silicon bottom cell. Finally, this monolithic tandem approach does not rely on the SnO 2 for lateral conducti...

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Section: Approachmentioning

confidence: 99%

Large area efficient interface layer free monolithic perovskite/homo-junction-silicon tandem solar cell with over 20% efficiency

Zheng

Lau

Mehrvarz

et al. 2018

Energy Environ. Sci.

Self Cite

197

186

View full text Add to dashboard Cite

show abstract

“…The optimized thickness of the perovskite layer varies depending on the different tandem structures. For example, the change of the top transparent electrode from ITO to DMD (MoO x /Au/MoO x multi‐layer transparent electrode) could result in a thinner optimized thickness for the perovskite layer to meet the current match of the top and bottom sub‐cells in the tandem model of Jiang et al The change of reflection or conductivity of the top electrode, as well as the carrier recombination behaviors in the solar device, could also affect the optimized perovskite thickness …”

Section: Optical Simulationmentioning

confidence: 99%

Recent Development of Organic-Inorganic Perovskite-Based Tandem Solar Cells

Cheng

Fan

et al. 2017

Sol. RRL

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Tandem cells are solar cells made of multiple junctions with tunable absorbing materials, which aim to overcome the Shockley–Queisser limit of single junction solar cells. Recently, organic–inorganic hybrid perovskite solar cells have stirred enormous interest as ideal candidates for tandem cells, due to high open circuit voltage, relatively wide optical bandgap, and low temperature solution processibility. So far, a great number of review papers have been focused on the development of a single junction, in the context of the investigation of operational principles, the materials growth/understanding, and interface engineering. Here, we have provided a summary of the recent developments in the realization and understanding of perovskite‐based tandem cells. The optical simulations for the design of perovskite‐based tandem cells are first presented in order to optimize the device architecture in theoretical perspective. Then, an overview of the recent progress in silicon–perovskite, perovskite–perovskite, and others–perovskite tandem cells is highlighted. Specifically, we will focus on the key issues for high efficiency tandem cells, e.g., transparent electrodes, intermediate layers, and bandgap engineering. Suggestions with respect to the further improvement toward perovskite tandem optoelectronics are discussed based on the available literature.

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“…According to detailed balance (Shockley-Queisser limit) calculations, tandem solar cells with bandgaps DOI: 10.1002/adts.201800030 of 1.7 and 1.1 eV for the top and bottom solar cell, respectively, can even achieve energy conversion efficiency exceeding 40%. [12,13] Amorphous silicon material with a bandgap of 1.7 eV exhibits an almost perfect bandgap for the realization of highly efficient tandem solar cells. So far, perovskite/crystalline silicon tandem solar cells in two-terminal and four-terminal configurations have reached energy conversion efficiencies of 23.6% and 26.4%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Approaching Perfect Light Incoupling in Perovskite and Silicon Thin Film Solar Cells by Moth Eye Surface Textures

Qarony

Hossain

Dewan

et al. 2018

Advcd Theory and Sims

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Solar cells with increased short-circuit current density and energy conversion efficiency can be realized by integrating moth eye textures in the design of perovskite and amorphous silicon thin film solar cells. Broadband light incoupling in solar cells can be achieved by using hexagonally arranged arrays of nipples or domes with parabolically shaped surface profiles. The moth eye surface texture represents a refractive index grating that allows for an efficient incoupling of light in the solar cell while minimizing reflection losses. The light incoupling is studied for perovskite and amorphous silicon solar cells. Perovskite has a rather low refractive index of 2.5, while amorphous silicon exhibits a refractive index of 4.5 comparable to that of crystalline silicon. Due to largely different refractive indices, different device designs must be selected to allow for an efficient light incoupling in the solar cell. 3D finite-difference time-domain simulations are used for the optical modeling. Design guidelines are provided on how to realize perovskite and silicon thin film solar cells with high quantum efficiency and short-circuit current by using moth eye textures.

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Optical analysis of perovskite/silicon tandem solar cells

Abstract: A detailed optical analysis of the absorption distribution, parasitic absorption and reflection losses in various semi-transparent perovskite solar cell structures and their impact on tandem cell efficiencies is reported.

Cited by 117 publications

References 37 publications

Large area efficient interface layer free monolithic perovskite/homo-junction-silicon tandem solar cell with over 20% efficiency

Large area efficient interface layer free monolithic perovskite/homo-junction-silicon tandem solar cell with over 20% efficiency

Recent Development of Organic-Inorganic Perovskite-Based Tandem Solar Cells

Approaching Perfect Light Incoupling in Perovskite and Silicon Thin Film Solar Cells by Moth Eye Surface Textures

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