Back-contact perovskite solar cells with honeycomb-like charge collecting electrodes

Hou, Qicheng; Bacal, Dorota M; Jumabekov, Askhat N.; Li, Wei; Wang, Ziyu; Lin, Xiongfeng; Ng, Soon Hock; Tan, Boer; Bao, Qiaoliang; Chesman, Anthony S. R.; Cheng, Yi; Bach, Udo

doi:10.1016/j.nanoen.2018.06.006

Cited by 49 publications

(58 citation statements)

References 27 publications

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“…Notably, conflicting opinions on charge diffusion length of free charge carriers in perovskite solar cells in which holes can diffuse a longer distance than electrons from charge mobility studies have been reported . Recently, photocurrent mapping with electrode dimensions were studied in terms of photovoltaic performance, and the authors reported a hole‐collecting electrode with a 1 μm optimized distance, which is close to our optimized electrode distance of 1.5 μm. However, we found that a perovskite film thickness of 1 μm or more produces a polycrystalline film with cracks that has a substantially lower photoconversion efficiency than that documented .…”

Section: Resultsmentioning

confidence: 99%

Interdigitated Hierarchical Integration of an Efficient Lateral Perovskite Single‐Crystal Solar Cell

et al. 2020

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Single‐crystal perovskite thin films were prepared by a scalable, one‐step, geometrically confined lateral crystal growth (GC‐LCG) method on a patterned rolling mold and used for a photovoltaic study. A record solar cell efficiency of 9.50 % under 0.1 sun with an electrode spacing of 1.5 μm is attained in lateral single‐crystal perovskite materials. Moreover, successful integration for high‐source‐power‐generation interdigitated electrode units patterned in series (1×4), parallel (4×1), and combination (4 series×4 parallel) configurations is devised and affords maximum efficiencies of 7.99, 8.19, and 7.96 %, respectively. Additionally, the cell performances under various illumination intensities (0.1, 0.2, 0.4, 0.6, 0.8, 1.0 sun) to mimic daily sunshine angles and an indoor environment at 1000 lux are elucidated for which short‐circuit current (JSC) values (19.60 mA cm−2 and η=7.43 %) under 1.0 sun and a significant efficiency of 8.13 % under indoor conditions are obtained. This work represents a significant step towards next‐generation, efficient, lateral photovoltaics for possible module integration.

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Section: Resultsmentioning

confidence: 99%

Interdigitated Hierarchical Integration of an Efficient Lateral Perovskite Single‐Crystal Solar Cell

et al. 2020

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“…For the common planar type architecture, where a perovskite layer of a few hundred nm thickness is sandwiched between charge selective layers, grain sizes on that same length scale are usually sufficient to span both electrodes to ensure unhindered charge transport. When, however, the hunt for record efficiencies moves perovskite research towards back-contacted architectures as it has for conventional photovoltaics, the superior lateral conductivity of grains bridging many micrometers between electrodes may become essential for efficient charge extraction [15,41,42].…”

Section: Applicability and Perspectivesmentioning

confidence: 99%

Curing perovskites—a way towards control of crystallinity and improved stability

et al. 2020

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Power conversion efficiencies of lead halide perovskite solar cells have rapidly increased in the decade since their emergence, reaching 25% this year. However, reliable film uniformity and device stability remain hard to achieve and often require precise compliance with complicated protocols, which hampers upscaling towards industrial applications. Here, we explore the potential of an alternative route towards high-quality perovskite films: The reaction between a pre-existing perovskite film and methylamine (MA) gas has been shown to possess the striking ability to both improve film morphology and increase grain size drastically, boosting device performance. This post-deposition treatment could provide the means to decouple film quality from the initial deposition process, thus promising to facilitate upscaling and lowering production costs. Furthermore, such MA gas treatments show great promise regarding the stability of fabricated devices, as they open up the opportunity to reduce or even eliminate the adverse role of grain boundaries in film degradation.

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“…15,16,114 MA-J: What has been done so far with IBC perovskite solar cells? MA: There have been only a few reports on IBC solar cells employing perovskites, some focussed on device optimization [114][115][116][117] and others focussed on understanding the device physics of perovskite materials 15,16 . In addition to the advantages mentioned above, IBC devices have been proposed by Bach's group as a potential solution to overcome issues related to pin holes (i.e.…”

Section: Interdigitated Back-contact Solar Cellsmentioning

confidence: 99%

“…shorting between electrodes) and mitigating damages of the perovskite layer during the top electrode deposition. 115 In 2016 this group proposed the concept of the quasi-interdigitated electrodes architecture (see Figure 5c) and reported stable MAPbI 3 devices with a PCE of 3.2%. 114 The drawback of this architecture is that it involves rather complicated photolithography and multiple deposition steps, which is a bottleneck for large scale production.…”

Section: Interdigitated Back-contact Solar Cellsmentioning

confidence: 99%

“…This device structure is based on honeycomb-like charge collecting electrodes, but it introduces further complications involving photolithography and e-beam evaporation, which are probably unsuitable for large scale production. 115 MA-J: Can you talk about how the IBC architecture was used in our recent publication? 15 MA: In our two recent studies we use the IBC perovskite structure to investigate the charge dynamics and the correlations between the structural and opto-electrical properties of these solar cells during film formation and in these two studies we use a simple IBC structure.…”

Section: Interdigitated Back-contact Solar Cellsmentioning

confidence: 99%

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Back-Contact Perovskite Solar Cells

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et al. 2019

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Interdigitated back-contact (IBC) architectures are the best performing technology in crystalline Si (c-Si) photovoltaics (PV). Although single junction perovskite solar cells have now surpassed 23% efficiency, most of the research has mainly focussed on planar and mesostructured architectures. The number of studies involving IBC devices is still limited and the proposed architectures are unfeasible for large scale manufacturing. Here we discuss the importance of IBC solar cells as a powerful tool for investigating the fundamental working mechanisms of perovskite materials. We show a detailed fabrication protocol for IBC perovskite devices that does not involve photolithography and metal evaporation. The interview is available at https://youtu.be/nvuNC29TvOY.

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Back-contact perovskite solar cells with honeycomb-like charge collecting electrodes

Cited by 49 publications

References 27 publications

Interdigitated Hierarchical Integration of an Efficient Lateral Perovskite Single‐Crystal Solar Cell

Interdigitated Hierarchical Integration of an Efficient Lateral Perovskite Single‐Crystal Solar Cell

Curing perovskites—a way towards control of crystallinity and improved stability

Back-Contact Perovskite Solar Cells

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