Impact of surface dipole in NiOx on the crystallization and photovoltaic performance of organometal halide perovskite solar cells

Cheng, Yuanhang; Li, Menglin; Liu, Xixia; Cheung, Sin Hang; Chandran, Hrisheekesh Thachoth; Li, Ho Wa; Xu, Xiuwen; Xie, Yue‐Min; So, Shu Kong; Yip, Hin‐Lap; Tsang, Sai‐Wing

doi:10.1016/j.nanoen.2019.05.004

Cited by 99 publications

(83 citation statements)

References 52 publications

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“…The hysteresis of p-i-n PSC devices based on Ni:Ox was also reported in the literature as we have previously stated, and it was shown to have a recoverable effect on the PCE of the device upon light soaking [ 29 ]. In our case, even though the hysteresis reduced significantly after light soaking for 20 min, the PCE was not recovered; on the contrary, it decreased, primarily due to a decrease in J sc .…”

Section: Resultssupporting

confidence: 55%

“…For instance, PSCs based on combustion synthesis (CS)of NiOx films have been reported to exhibit better ambient stability compared to their sol-gel counterparts due to better interface with the perovskite as well as better perovskite film quality [ 28 ]. A more recent approach for Cu:NiOx synthesis incorporates a sol-gel approach with various organic solvents in order to avoid toxic catalysts [ 29 ]. Another factor that can negatively impact the stability of PSCs is the presence of organic ligands on the surface of nanoparticle suspensions of NiOx [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…Even by solely considering the nature of NiOx films, the situation is not straightforward. The PCE of NiOx-based PSCs was reported to have a large variation between 8% and 20%, even in cases where similar synthesis and deposition methods of NiOx were used [ 29 ]. Furthermore, hysteresis effects have also been observed.…”

Section: Introductionmentioning

confidence: 99%

“…This can cause device limitations due to the appearance of surface dipoles in NiOx, which can attract perovskite precursor ions (e.g., CH 3 NH 3 + , I − , and Pb 2+ ) during the crystallization process and induce ionic vacancies and defects in the perovskite crystal. This is particularly apparent if NiOx is used as a HTL for inverted p-i-n PVSCs, because it acts as the underlayer and will affect the crystallization process of the perovskite [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

et al. 2020

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Inverted perovskite solar cells (PSCs) using a Cu:NiOx hole transporting layer (HTL) often exhibit stability issues and in some cases J/V hysteresis. In this work, we developed a β-alanine surface treatment process on Cu:NiOx HTL that provides J/V hysteresis-free, highly efficient, and thermally stable inverted PSCs. The improved device performance due to β-alanine-treated Cu:NiOx HTL is attributed to the formation of an intimate Cu:NiOx/perovskite interface and reduced charge trap density in the bulk perovskite active layer. The β-alanine surface treatment process on Cu:NiOx HTL eliminates major thermal degradation mechanisms, providing 40 times increased lifetime performance under accelerated heat lifetime conditions. By using the proposed surface treatment, we report optimized devices with high power conversion efficiency (PCE) (up to 15.51%) and up to 1000 h lifetime under accelerated heat lifetime conditions (60 °C, N2).

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

et al. 2020

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“…The world-record power conversion efficiency (PCE) of organometallic perovskite solar cells (PSCs) has rapidly increased to 25.2% within ten years due to the superb optoelectronic properties of the organometallic perovskite materials [1][2][3][4]. However, the long-term stability issue remains a key obstacle for the commercialization of PSCs [5].…”

mentioning

confidence: 99%