Cerium oxide as an efficient electron extraction layer for p–i–n structured perovskite solar cells

Hu, Ting; Xiao, Shuqin; Yang, Hanjun; Chen, Lie; Chen, Yiwang

doi:10.1039/c7cc08657a

Cited by 62 publications

(41 citation statements)

References 41 publications

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“…Though poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) and SnO 2 were proposed as more stable HTL and ETL, respectively, the PSCs assembled with these materials degrade under exposure to light and heat . Therefore, other types of charge‐transport materials, such as In 2 O 3 , ZrO 2 , CeO x , CdS, BaTiO 3 , CuCrO x , Fe 2 O 3 , etc., are actively explored, whereas the target long‐term stability of PSCs is still not achieved.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

et al. 2020

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There is growing evidence that the stability of perovskite solar cells (PSCs) is strongly dependent on the interface chemistry between the absorber films and adjacent charge‐transport layers, whereas the exact mechanistic pathways remain poorly understood. Herein, a straightforward approach is presented for decoupling the degradation effects induced by the top fullerene‐based electron transport layer (ETL) and various bottom hole‐transport layer (HTL) materials assembled in p‐i‐n PSCs. It is shown that chemical interaction of MAPbI3 absorber with ETL comprised of the fullerene derivative most aggressively affects the device operational stability. However, washing away the degraded fullerene derivative and depositing fresh ETL leads to restoration of the initial photovoltaic performance when bottom perovskite/HTL interface is not degraded. Following this approach, it is possible to compare the photostability of stacks with various HTLs. It is shown that poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and NiOx induce significant degradation of the adjacent perovskite layer under light exposure, whereas poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) provides the most stable perovskite/HTL interface. A time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) analysis allows identification of chemical origins of the interactions between MAPbI3 and HTLs. The proposed research methodology and the revealed degradation pathways should facilitate the development of efficient and stable PSCs.

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Section: Introductionmentioning

confidence: 99%

Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

et al. 2020

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“…For example, Hu et al developed a lowtemperature solution-processed method to deposit a dense CeO x on top of the perovskite to act as ETL. [187] The dense CeO x could protect perovskite from water and the electrode corrosion from perovskite decomposition products. After stored in N 2 for 200 h, devices based on CeO x retained >90% of the initial PCE, while reference PSCs based on PCBM decreased to 20% of the initial PCE after 160 h. [187] Furthermore, Yang et al reported an ZnO nanoparticle ETL serving as the robust elemental interdiffusion barrier between perovskite and metal electrode.…”

Section: Inorganic Ctl As Barriersmentioning

confidence: 99%

Barrier Designs in Perovskite Solar Cells for Long‐Term Stability

Zhang

Liu

Zhang

et al. 2020

Advanced Energy Materials

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Perovskite solar cells (PSCs) have attracted much attention in the past decade and their power conversion efficiency has been rapidly increasing to 25.2%, which is comparable with commercialized solar cells. Currently, the long‐term stability of PSCs remains as a major bottleneck impeding their future commercial applications. Beyond strengthening the perovskite layer itself and developing robust external device encapsulation/packaging technology, integration of effective barriers into PSCs has been recognized to be of equal importance to improve the whole device’s long‐term stability. These barriers can not only shield the critical perovskite layer and other functional layers from external detrimental factors such as heat, light, and H2O/O2, but also prevent the undesired ion/molecular diffusion/volatilization from perovskite. In addition, some delicate barrier designs can simultaneously improve the efficiency and stability. In this review article, the research progress on barrier designs in PSCs for improving their long‐term stability is reviewed in terms of the barrier functions, locations in PSCs, and material characteristics. Regarding specific barriers, their preparation methods, chemical/photoelectronic/mechanical properties, and their role in device stability, are further discussed. On the basis of these accumulative efforts, predictions for the further development of effective barriers in PSCs are provided at the end of this review.

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“…Low‐temperature‐processed CeO x was successfully used as ETLs in high‐performance PSCs by Deng et al and a PCE of 14.32% was obtained . Chen and co‐workers reported solution‐processed CeO x as effective ETLs for inverted PSCs and achieved a best PCE of 17.1% . They found that the inorganic CeO x can protect the perovskite against water and act as a diffusion barrier to improve the long‐term stability of PSCs.…”

Section: Binary and Ternary Mo Compoundsmentioning

confidence: 99%

To Be Higher and Stronger—Metal Oxide Electron Transport Materials for Perovskite Solar Cells

Zhou

Lin

2019

Small

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Organometallic mixed halide perovskite solar cells (PSCs) have emerged as a promising photovoltaic technology with increasingly improved device efficiency exceeding 24%. Charge transport layers, especially electron transport layers (ETLs), are verified to play a vital role in device performance and stability. Recently, metal oxides (MOs) have been widely studied as ETLs for high‐performance PSCs due to their excellent electronic properties, superb versatility, and great stability. This Review briefly discusses the development of PSCs' architecture and outlines the requirements for MO ETLs. Additionally, recent progress of MO ETLs from preparation to optimization for efficient PSCs is systematically summarized and highlighted to associate the versatility of MO ETLs with the performance of devices. Finally, a summary and prospectives for the future development of MO ETLs toward practical application of high‐performance PSCs are drawn.

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Cerium oxide as an efficient electron extraction layer for p–i–n structured perovskite solar cells

Cited by 62 publications

References 41 publications

Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

Barrier Designs in Perovskite Solar Cells for Long‐Term Stability

To Be Higher and Stronger—Metal Oxide Electron Transport Materials for Perovskite Solar Cells

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