All-inorganic perovskite solar cells with efficiency &gt;20%

Zhang, Di; Tian, Jianjun

doi:10.1007/s40843-021-1726-9

Cited by 15 publications

(11 citation statements)

References 12 publications

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“…[1][2][3][4][5][6][7] The record power conversion efficiency (PCE) of the perovskite solar cells has increased from 3.8% to 25.8% over the past decade. [8][9][10][11][12][13] Optimization of the device structure is one of the reasons for the rapid increase in efficiency. [14][15][16][17] Electron transport layers (ETLs) are one of the key constituent parts of the solar cells, which play an important role in transporting electrons and blocking holes.…”

Section: Introductionmentioning

confidence: 99%

Efficient Perovskite Solar Cells Based on Tin Oxide Nanocrystals with Difunctional Modification

Yan

et al. 2022

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Tin oxide (SnO2) nanocrystals‐based electron transport layer (ETL) has been widely used in perovskite solar cells due to its high charge mobility and suitable energy band alignment with perovskite, but the high surface trap density of SnO2 nanocrystals harms the electron transfer and collection within device. Here, an effective method to achieve a low trap density and high electron mobility ETL based on SnO2 nanocrystals by devising a difunctional additive of potassium trifluoroacetate (KTFA) is proposed. KTFA is added to the SnO2 nanocrystals solution, in which trifluoroacetate ions could effectively passivate the oxygen vacancies (OV) in SnO2 nanocrystals through binding of TFA− and Sn4+, thus reducing the traps of SnO2 nanocrystals to boost the electrons collection in the solar cell. Furthermore, the conduction band of SnO2 nanocrystals is shifted up by surface modification to close to that of perovskite, which facilitates electrons transfer because of the decreased energy barrier between ETL and perovskite layer. Benefiting from the decreased trap density and energy barrier, the perovskite solar cells exhibit a power conversion efficiency of 21.73% with negligible hysteresis.

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Section: Introductionmentioning

confidence: 99%

Efficient Perovskite Solar Cells Based on Tin Oxide Nanocrystals with Difunctional Modification

Yan

et al. 2022

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“…Organic and inorganic metal halide perovskites with unique physical and chemical properties, such as low exciton binding energy, long charge carrier diffusion length, high absorption coefficients, and high carrier mobility, have attracted extensive research interest in the photovoltaic field. − Since 2009, Miyasaka and co-authors applied halide perovskites as a sensitizer in the solar cells for the first time; remarkable efforts have been made to improve the power conversion efficiency (PCE) and working stability of perovskite solar cells (PSCs) through device architecture optimization, surface or interface engineering, elimination of defects, optimizing their precursor and reaction kinetics, and encapsulation. − These contribute to an ever-increasing PCE. , As the most promising next-generation solar cell in the field of photovoltaic industry, one of the key issues hindering the development of PSCs is the defects at the perovskite–metal electrodes and perovskite–substrate interfaces, which serve as the nonradiative recombination centers to accelerate the decomposition of the perovskite layer, leading to irreversible damage of the photovoltaic device. − Currently, due to the fact that it is easy to observe the upper surface and detect the changes after passivation, most of the reported interface passivation studies concentrated on the upper interface by surface passivation or postmodification. − However, it has proved that the nonradiative recombination near the buried interface is more serious due to an even higher trap density, which degrades the device performance. , In addition, there are large amounts of voids along with the buried interface, which may deteriorate the decomposition of the perovskite. , Thus, it is of great importance to passivate surface defects and reinforce the interface contact.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance and Stability of Perovskite Solar Cells through Buried Interface Passivation Using Potassium Hydroxide

Wang

Huang

et al. 2022

ACS Appl. Energy Mater.

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Charge carrier recombination caused by the buried interface defects in perovskite solar cells is widely accepted as a challenge that seriously degrades device performance and stability. Herein, we devise a facile method to passivate the buried titanium dioxide (TiO 2 )/perovskite interface using potassium hydroxide (KOH) through a wet chemical process. OH − and K + can coordinate with the undercoordinated Ti and O on the TiO 2 surface, respectively. Meanwhile, due to the strong interaction between K + and Br − , Br − in the MAPbI 2.85 Br 0.15 perovskite would be attracted and thus migrate toward the TiO 2 /perovskite interface during the formation process. Hence, KOH can not only passivate the interface but also effectively glue the TiO 2 electron transfer layer and the perovskite layer together to generate a tightly integrated interface, which effectively reduces interface defects. Moreover, KOH at the interface can mediate the nucleation process and promote the formation of the perovskite layer with less defects. Thus, improved charge carrier extraction and reduced nonradiative recombination are achieved. As a result, the perovskite solar cell with KOH interface passivation demonstrates an increase in power conversion efficiency from 17.12 to 19.19%, associated with a good improvement of stability.

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“…It is well known that inorganic materials usually show superior stability compared to organic materials. Therefore, fully substituting the organic components by the inorganic cation (Cs + ) is expected to be a viable solution to dramatically enhance the stability of perovskite materials. − …”

Section: Introductionmentioning

confidence: 99%

Interface Modification via a Hydrophobic Polymer Interlayer for Highly Efficient and Stable Carbon-Based Inorganic Perovskite Solar Cells

Wang

Miao

et al. 2022

Energy Fuels

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The Serious interfacial recombination and low-efficient hole extraction at the interface of the carbon electrode and perovskite film have strikingly limited the performance improvement of carbon-based inorganic perovskite solar cells (PSCs). Here, hydrophobic poly(3-hexylthiophene) (P3HT) and polystyrene (PS) are employed as the interlayer to modify the interface of the CsPbIBr2 perovskite and the carbon electrode for enhancing the hole extraction and reducing the interfacial recombination. The effect of the PS and P3HT interlayer on the stability of the CsPbIBr2 perovskite film and the performance of carbon-based devices are systemically investigated. Both PS and the P3HT interlayer remarkably enhance the stability of the CsPbIBr2 perovskite film by inhibiting the intrusion of ambient moisture. However, the incorporation of the PS interlayer deteriorates the efficiency of the device, mainly owing to the low tunneling rate of the holes within the insulated PS layer. By contrast, introduction of the P3HT interlayer greatly improves the performance of the carbon-based CsPbIBr2 cells. The cell with the P3HT interlayer delivers a high power conversion efficiency of 7.47%, largely increased by 36% compared with the efficiency for the control device. Additionally, the P3HT interlayer greatly promotes the long-term stability of carbon-based CsPbIBr2 PSCs in ambient conditions.

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All-inorganic perovskite solar cells with efficiency >20%

Cited by 15 publications

References 12 publications

Efficient Perovskite Solar Cells Based on Tin Oxide Nanocrystals with Difunctional Modification

Efficient Perovskite Solar Cells Based on Tin Oxide Nanocrystals with Difunctional Modification

Improving the Performance and Stability of Perovskite Solar Cells through Buried Interface Passivation Using Potassium Hydroxide

Interface Modification via a Hydrophobic Polymer Interlayer for Highly Efficient and Stable Carbon-Based Inorganic Perovskite Solar Cells

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