Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

Kanda, Hiroyuki; Shibayama, Naoyuki; Huckaba, Aron J.; Lee, Yonghui; Paek, Sanghyun; Klipfel, Nadja; Roldán‐Carmona, Cristina; Queloz, Valentin I. E.; Grancini, Giulia; Zhang, Yi; Abuhelaiqa, Mousa; Cho, Kyung Taek; Li, Mo; Mensi, Mounir; Kinge, Sachin; Nazeeruddin, Mohammad Khaja

doi:10.1039/c9ee02028d

Cited by 123 publications

(125 citation statements)

References 53 publications

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“…Recently, several publications have reported empirically developed strategies to improve device performance, by employing such passivation layers at the perovskite/HEL interface. [ 34–38 ] However, the exact mechanism behind these passivation strategies is still not investigated in detail. The findings reported in this study may give a first understanding about the role of passivation layers at the perovskite/HEL interface.…”

Section: Resultsmentioning

confidence: 99%

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The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

Hellmann

Das

Abzieher

et al. 2020

Advanced Energy Materials

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High power conversion efficiency (PCE) perovskite solar cells (PSCs) rely on optimal alignment of the energy bands between the perovskite absorber and the adjacent charge extraction layers. However, since most of the materials and devices of high performance are prepared by solution‐based techniques, a deposition of films with thicknesses of a few nanometers and therefore a detailed analysis of surface and interface properties remains difficult. To identify the respective photoactive interfaces, photoelectron spectroscopy measurements are performed on device stacks of methylammonium‐lead‐iodide (MAPI)‐based PSCs in classical and inverted architectures in the dark and under illumination at open‐circuit conditions. The analysis shows that vacuum‐deposited MAPI perovskite absorber layers are n‐type, independent of the architecture and of the charge transport layer that it is deposited on (n‐type SnO2 or p‐type NiOx). It is found that the majority of the photovoltage is formed at the n‐MAPI/p‐HEL (hole extraction layer) junction for both architectures, highlighting the importance of this interface for further improvement of the photovoltage and therefore also the PCE. Finally, an experimentally derived band diagram of the completed devices for the dark and the illuminated case is presented.

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Section: Resultsmentioning

confidence: 99%

“…The importance of the n‐MAPI/p‐HEL interface might also explain, why many of the recently reported passivation layers that are used to improve the PCE are employed in between the perovskite absorber and the HEL. [ 34–38 ]…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

Hellmann

Das

Abzieher

et al. 2020

Advanced Energy Materials

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“…[ 8–12 ] In order to further improve the stability and efficiency of PSCs, it is necessary to select appropriate passivators to modify the interface of the PVSK layer. [ 13–16 ] In the past few years, numerous studies have demonstrated that functional groups, such as pyridine, thiophene, iodopentafluorobenzene, [ 17 ] cyano, [ 18 ] sulfonate (OSO 3 − ), [ 19 ] fluorine, carboxylic acid could act as the passivator of defects in perovskite film, for example, under‐coordinated Pb 2+ cations, and hence reduce the nonradiative charge recombination. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

Donor–π–Acceptor Type Porphyrin Derivatives Assisted Defect Passivation for Efficient Hybrid Perovskite Solar Cells

Mai

Zhou

Xiong

et al. 2020

Adv Funct Materials

115

106

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In recent years, hybrid perovskite solar cells (PSCs) have attracted much attention owing to their low cost, easy fabrication, and high photoelectric conversion efficiency. Nevertheless, solution‐processed perovskite films usually show substantial structural disorders, resulting in ion defects on the surface of lattice and grain boundaries. Herein, a series of D–π–A porphyrins coded as CS0, CS1, and CS2 that can effectively passivate the perovskite surface, increase VOC and FF, reduce the hysteresis effect, enhance power conversion efficiency to be higher than 22%, and improve the device stability is developed. The results in this study demonstrated that the donor–π–acceptor type porphyrin derivatives are promising passivators that can improve the cell performance of PSCs.

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“…[28][29][30] In fact, numerous PSCs throughout the literature demonstrate severely hampered stability under illumination. [31,32] Therefore, the photostability is essential for the commercial success of single-junction PSCs and tandem solar cells that combines perovskites with silicon.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and Suppression of Photoinduced Degradation in Perovskite Solar Cells

Wei

Wang

Huo

et al. 2020

Advanced Energy Materials

147

170

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Solar cells based on metal halide perovskites have reached a power conversion efficiency as high as 25%. Their booming efficiency, feasible processability, and good compatibility with large‐scale deposition techniques make perovskite solar cells (PSCs) desirable candidates for next‐generation photovoltaic devices. Despite these advantages, the lifespans of solar cells are far below the industry‐needed 25 years. In fact, numerous PSCs throughout the literature show severely hampered stability under illumination. Herein, several photoinduced degradation mechanisms are discussed. With light radiation, the organic–inorgainc perovskites are prone to phase segregation or chemical decomposition; the oxide electron transport layers (ETLs) tend to introduce new defects at the interface; the commonly used small molecules‐based hole transport layers (HTLs) typically suffer from poor photostability and dopant diffusion during device operation. It has been demonstrated the photoinduced degradation can take place in every functional layer, including the active layer, ETL, HTL, and their interfaces. An overview of these degradation categories is provided in this review, in the hope of encouraging further research and optimization of relevant devices.

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Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

Abstract: It could successfully control the band-bending of the perovskite semiconductor, which led to improvement of the photovoltaic performance.

Cited by 123 publications

References 53 publications

The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

Donor–π–Acceptor Type Porphyrin Derivatives Assisted Defect Passivation for Efficient Hybrid Perovskite Solar Cells

Mechanisms and Suppression of Photoinduced Degradation in Perovskite Solar Cells

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