Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Liu, Tiantian; Zhang, Jie; Wu, Xin; Liu, Hongbin; Li, Fengzhu; Deng, Xiang; Lin, Francis; Li, Xiaosong; Zhu, Zonglong; Jen, Alex K.‐Y.

doi:10.1002/solr.202000205

Cited by 40 publications

(35 citation statements)

References 60 publications

(69 reference statements)

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“…[ 8–11 ] As an alternative to organic–inorganic perovskites having volatile organic cations, all‐inorganic perovskites with cesium (Cs + ) at A‐site have recently drawn considerable attention because of their excellent thermal stability. [ 12–14 ] In particular, CsPbI 3 perovskite stands out from other inorganic perovskites due to its suitable bandgap that can be used for fabricating tandem cells. [ 14–16 ]…”

Section: Introductionmentioning

confidence: 99%

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Liu

Zhang

Qin

et al. 2021

Adv Funct Materials

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It is highly desirable for all‐inorganic perovskite solar cells (PVSCs) to have reduced nonideal interfacial charge recombination in order to improve the performance. Although the construction of a 2D capping layer on 3D perovskite is an effective way to suppress interfacial nonradiative recombination, it is difficult to apply it to all‐inorganic perovskites because of the resistance of Cs+ cesium ions in cation exchange reactions. To alleviate this problem, a simple approach using an ultra‐thin 2D perovskite to terminate CsPbI3 grain boundaries (GBs) without damaging the original 3D perovskite is developed. The 2D perovskite at the GBs not only enhances the charge‐carrier extraction and transport but also effectively suppresses nonradiative recombination. In addition, because the 2D perovskite can prevent the moisture and oxygen from penetrating into the GBs and at the same time suppress the ion migration, the 2D terminated CsPbI3 films exhibit significantly improved stability against humidity. Moreover, the devices without encapsulation can retain ≈81% of its initial power conversion efficiency (PCE) after being stored at 40 ± 5% relative humidity for 84 h. The 2D‐based champion device exhibits a high PCE of 18.82% with a high open‐circuit voltage of 1.16 V.

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Section: Introductionmentioning

confidence: 99%

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Liu

Zhang

Qin

et al. 2021

Adv Funct Materials

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“…For example, using 5‐amino‐2,4,6‐triiodoisophthalic acid (ATPA) to optimize the TiO 2 ETL/inorganic CsPbI 3 perovskite layer interface, a high efficiency of 18.2% was obtained and the hysteresis was significantly suppressed. [ 229 ] This is because ATPA optimizes the energy‐level arrangement between TiO 2 and perovskite to promote charge extraction, and ATPA can passivate defects on the surface of the perovskite film to reduce interface recombination ( Figure a). The ionic liquid 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF 4 ) modified the ETL/perovskite interface can also reduce the hysteresis.…”

Section: Methods Of Reducing or Eliminating Hysteresismentioning

confidence: 99%

Section: Methods Of Reducing or Eliminating Hysteresismentioning

confidence: 99%

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Wang

Lei

et al. 2020

Solar RRL

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The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 25%, showing great potential in the photovoltaic field. However, PSCs often show anomalous current density–voltage (J–V) hysteresis behavior in the forward and reverse scanning directions, which makes it impossible to accurately evaluate the performance of PSCs. Therefore, it is necessary to clearly understand the mechanism of hysteresis and suppress the hysteresis. Herein, the J–V hysteresis behavior in PSCs and strategies to suppress hysteresis is focused: first, the various factors that affect J–V hysteresis in PSCs are summarized. And the mechanism behind the various possible origins of hysteresis and the challenges encountered are explored. Then, the strategies to suppress or eliminate the hysteresis are summarized, including optimizing the perovskite light‐absorbing layer, improving the performance of the carrier transport layer and interface engineering. Finally, insights on the future development of the hysteresis are also provided.

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“…Very recent work demonstrated that modifying the TiO 2 surface with 5‐amino‐2,4,6‐triiodoisophthalic acid resulted in cascade energy–level alignment at TiO 2 /CsPbI 3 , which well enhanced electron extraction and improved PCE. [ 115 ] Therefore, future research should pay more attention to this interface and suitable additive engineering should be exploited.…”

Section: Issues and Future Research Directionsmentioning

confidence: 99%

Additive Engineering Toward High‐Performance CsPbI₃Perovskite Solar Cells

Guo

Liu

et al. 2020

Solar RRL

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All‐inorganic perovskite solar cells (PSCs) have attracted a lot of attention in the past few years because of their preeminent thermal stability compared with organic–inorganic hybrid PSCs. Among all kinds of all‐inorganic perovskites, CsPbI3 perovskite with a proper bandgap of ≈1.7 eV becomes the most competitive candidate. However, its poor phase stability, hydrophobicity, and high‐density defects have limited the development of CsPbI3 PSCs. To overcome these obstacles for achieving high‐performance CsPbI3 PSCs, additive engineering has been widely used, which has rapidly promoted the power conversion efficiency (PCE) to over 19%. Herein, the progress of additive engineering in CsPbI3 PSCs is systematically reviewed. First, the roles of additives in CsPbI3 PSCs are introduced, including improving phase stability, increasing moisture resistance, and passivating defects. Then, the additive engineering is categorized (additive engineering in perovskites and at perovskite/hole transport layer interfaces) and reviewed in detail. Finally, future research directions on additive engineering are suggested for further enhancing stability and improving PCE.

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Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Cited by 40 publications

References 60 publications

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Additive Engineering Toward High‐Performance CsPbI₃Perovskite Solar Cells

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Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Cited by 40 publications

References 60 publications

Modifying Surface Termination of CsPbI3 Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Modifying Surface Termination of CsPbI3 Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Additive Engineering Toward High‐Performance CsPbI3Perovskite Solar Cells

Contact Info

Product

Resources

About

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Modifying Surface Termination of CsPbI₃ Grain Boundaries by 2D Perovskite Layer for Efficient and Stable Photovoltaics

Additive Engineering Toward High‐Performance CsPbI₃Perovskite Solar Cells