Theoretical analysis on effect of band offsets in perovskite solar cells

Minemoto, Takashi; Murata, Masashi

doi:10.1016/j.solmat.2014.10.036

Cited by 468 publications

(299 citation statements)

References 38 publications

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“…[23,[34][35][36] In general,i nterface recombination in PSCs depends not only on interfaciald efects, but also more importantly on the interfacial bands tructure, [37,38] which is both theoretically supported and experimentally demonstrated. [23,[34][35][36] In general,i nterface recombination in PSCs depends not only on interfaciald efects, but also more importantly on the interfacial bands tructure, [37,38] which is both theoretically supported and experimentally demonstrated.…”

Section: Introductionmentioning

confidence: 81%

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells

et al. 2019

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Perovskite CsPbIBr2 is attracting ever‐increasing attention for carbon‐based, all‐inorganic solar cells, owing to its well‐balanced band gap and stability features. However, significant interfacial recombination of charge carriers in solar cells fabricated with this active layer, which is intrinsically associated with the unwanted conduction band misalignment between CsPbIBr2 and the commonly used TiO2 electron transport layer, has limited power conversion efficiency (PCE) values. Herein, we demonstrate successful conduction band alignment engineering at the TiO2/CsPbIBr2 heterojunction by modifying TiO2 with CsBr clusters. Such modification triggers a beneficial increase in the conduction band minimum (CBM) of TiO2 from −4.00 to −3.81 eV and decreases the work function from 4.11 to 3.86 eV, thus promoting favorable band alignment at the heterojunction, suppressing recombination, and improving extraction and transport of charge carriers. As a result, the carbon‐based, all‐inorganic CsPbIBr2 solar cells exhibit over 20 % enhancement in average PCE. The champion device achieves a PCE of 10.71 %, a record among pure CsPbIBr2‐based cells, open‐circuit voltage of 1.261 V, and excellent stability.

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Section: Introductionmentioning

confidence: 81%

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells

et al. 2019

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“…[78] The energy levels for the commonly used materials in planar p-i-n PVSCs are shown in Figure 3. The work functions of adjacent layers in planar p-i-n PVSCs, which should match well with each other, can be effectively tailored by interface engineering.…”

Section: Energy-level Alignmentmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

367

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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“…Based on the results, the optimum conduction and valence band energy of buffer and HTM are 0.003 eV higher and 0.002 eV lower than the corresponding bands of absorber respectively. These results are essential guidelines in designing new buffer, absorber and HTM (Minemoto and Murata, 2015).…”

Section: Impact Of Conduction Band Offset (Cbo) and Valence Band Offsmentioning

confidence: 85%

Recent Advances in Fabrication Techniques of Perovskite Solar Cells: A Review

Ehtesham¹,

Wong²,

Wong³

et al. 2016

American Journal of Applied Sciences

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Abstract:In this study, thorough review is performed on various reported fabrication techniques of the Perovskite Solar Cell (PSC) and the Hole Transport Materials (HTM) layer, in order to provide a critical insight on the direction for further advancement in related fields as well as a better understanding on the device physics. So far, the best short-circuit current density of 22.9 mA/cm 2 has been reported in CH 3 NH 3 PbI 3-x Cl x scaffold by TiCl 4 nanorods treated by NRS and the best open circuit voltage of 0.763V has been reported in TiO 2 /perovskite/spiro-OMeTAD/Au. On the other hand, so far the highest PCE of the PSCs reported in the literature is 19.3%. Interestingly, PSC with 200nm mesoporous TiO 2 has been reported to achieve PCE value of 16.46%. A 5-layer TiO 2 /perovskite/spiroOMeTAD/Au integrated with 40 nm ZnO thin film has been reported to achieve Fill Factor (FF) of 76%. Although promising data has been obtained through numerous researches, there are still many other optimizations yet to be done before mass commercialization of PSC is possible. Optimizing the fabrication process of carrier transport material as well as the incorporation of sensitizer into the device structure are the key aspects that should be focused on in future researches.

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Theoretical analysis on effect of band offsets in perovskite solar cells

Cited by 468 publications

References 38 publications

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Recent Advances in Fabrication Techniques of Perovskite Solar Cells: A Review

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Theoretical analysis on effect of band offsets in perovskite solar cells

Cited by 468 publications

References 38 publications

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr2 Perovskite Solar Cells

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr2 Perovskite Solar Cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Recent Advances in Fabrication Techniques of Perovskite Solar Cells: A Review

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Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr₂ Perovskite Solar Cells