Enhanced moisture stability of mixed cation perovskite solar cells enabled by a room-temperature solution-processed organic-inorganic bilayer hole transport layer

Jin, In Su; Park, Sang Hyun; Kim, Kyeong Su; Jung, Jae Woong

doi:10.1016/j.jallcom.2020.156512

Cited by 16 publications

(8 citation statements)

References 27 publications

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“…Consequently, it facilitated hole extraction and suppressed charge recombination at the interface, resulting in a PCE of 19.2%. 514 Besides, CuSCN is either doped or combined with organic HTLs such as F4TCNQ, 515 PEDOT:PSS, 516 and spiro-OMeTAD 517 to reduce the energy barrier and improve the charge extraction at the interface.…”

Section: Hole Transport Layer (Htl)mentioning

confidence: 99%

Understanding the role of inorganic carrier transport layer materials and interfaces in emerging perovskite solar cells

et al. 2022

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Section: Hole Transport Layer (Htl)mentioning

confidence: 99%

Understanding the role of inorganic carrier transport layer materials and interfaces in emerging perovskite solar cells

et al. 2022

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“…The hydrophobicity of CuBr is higher than that of both CuI (Figure S17) and CuSCN, which makes it more stable under ambient conditions. 57 Also, owing to the larger hydrophobicity, we believe that CuBr would facilitate the growth of larger perovskite crystals compared to CuSCN and more hydrophilic CuI. Previous reports on CuI and CuSCN-based PSCs show that the HTL/perovskite interface contains defects that facilitate charge recombination and lead to device degradation.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…CuBr has numerous advantages over commonly used copper-based HTLs, such as CuI and CuSCN. The hydrophobicity of CuBr is higher than that of both CuI (Figure S17) and CuSCN, which makes it more stable under ambient conditions . Also, owing to the larger hydrophobicity, we believe that CuBr would facilitate the growth of larger perovskite crystals compared to CuSCN and more hydrophilic CuI.…”

Section: Resultsmentioning

confidence: 94%

Copper Bromide Hole Transport Layer for Stable and Efficient Perovskite Solar Cells

Javaid

Heller

Duzhko

et al. 2022

ACS Appl. Energy Mater.

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We demonstrate that replacing poly(3,4-ethylenedioxythiophene)-polystyrenesulfonate (PEDOT:PSS) with copper bromide (CuBr) as a hole transport layer (HTL) leads to highly efficient and stable inverted perovskite solar cells (PSCs). The CuBr-based devices showed an average power conversion efficiency (PCE) of 15.73% and a maximum PCE of 17.65%. Devices with PEDOT:PSS as the HTL had an average PCE of 10.94%. The active layer films fabricated on CuBr showed larger grain size distribution and improved crystallinity. Ultraviolet photoelectron spectroscopy and Kelvin probe force microscopy data reveal a favorable valence band alignment of CuBr with MAPbI3. We also found that CuBr-based devices exhibit a large built-in potential of 1.03 V compared to 0.77 V in PEDOT:PSS devices, which favors efficient hole extraction in the former. Compared to PEDOT:PSS, the CuBr-based PSCs also exhibited long-term stability in inert and humid environments.

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“…Apart from the materials engineering of the perovskite absorber layer, modification of interfacial charge transport layers also plays an important role in determining the charge extraction and recombination kinetics of PSCs 24‐28 . In particular, the moisture/oxygen permeability of the interfaces of the device can cause serious degradation of PSCs, so suitable selection of the optimal interfacial layers is critical to increasing PCE and stability of PSCs, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…23 Apart from the materials engineering of the perovskite absorber layer, modification of interfacial charge transport layers also plays an important role in determining the charge extraction and recombination kinetics of PSCs. [24][25][26][27][28] In particular, the moisture/oxygen permeability of the interfaces of the device can cause serious degradation of PSCs, so suitable selection of the optimal interfacial layers is critical to increasing PCE and stability of PSCs, simultaneously. Metal oxides such as titanium dioxide (TiO 2 ) or tin(IV) oxide (SnO 2 ) are typical electron transporting layers (ETLs) in the device with a regular (n-i-p) configuration due to their favorable energy band structure relative to the conduction band and valence band of perovskite absorber, decent electron conductivity, and high electrochemical stability.…”

Section: Introductionmentioning

confidence: 99%

A cascade bilayer electron transport layer toward efficient and stable Ruddlesden‐Popper perovskite solar cells

Kim

Lee

Jung

2022

Intl J of Energy Research

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Summary Optimal interfaces play a key role in charge transport/recombination characteristics and minimized potential loss of perovskite solar cells (PSCs). Currently, n‐type oxide semiconductors are the most common electron transport layer (ETL) material, but the imperfect electronic structure, unfavorable band alignment, and corresponding poor interface of ETL/perovskite absorber remain a great challenge for achieving a high photovoltaic performance of PSCs. Here, we combine a fullerene derivative or a non‐fullerene organic semiconductor with tin(IV) oxide (SnO2) to promise much‐improved surface and electronic structure of ETL interface in Ruddlesden‐Popper perovskites (RPPs)‐based photovoltaic devices. The organic semiconductors fill a bumpy surface of SnO2 to make the surface smoother, which effectively avoids the shunt pathways at the interface of the ETL/RPP absorber layer, and thereby suppresses unintended electron‐hole recombination. The organic‐inorganic bilayered ETLs also improve the electronic structure of the SnO2 surface, which provides favorable optoelectronic properties such as quick electron extraction and elongated carrier lifetime in the device. Moreover, the hydrophobic organic semiconductor is helpful in not only growing a uniform, compact, and largely grained RPP absorber layer but also improving the stability of the perovskite absorber layer. Benefiting from the optimized bilayer ETLs, the power conversion efficiency is obviously enhanced up to 10.17% in the RPP‐based photovoltaic devices. More importantly, the bilayer ETLs allow improved long‐term stability in ambient storage of the devices, providing a viable path to design practical interfaces of efficient and stable RPP‐based PSCs. Highlights Hybrid bilayer electron transport layer is designed to enhance the efficiency of Ruddlesden‐Popper perovskite solar cells. Phenyl‐C61‐butyric acid methyl ester and ITIC are inserted as n‐type organic semiconductors onto SnO2 film for the bilayer electron transport layer. Tailored optoelectronic properties of the bilayer electron transport layers deliver 10.17% efficiency of Ruddlesden‐Popper perovskite solar cells.

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Enhanced moisture stability of mixed cation perovskite solar cells enabled by a room-temperature solution-processed organic-inorganic bilayer hole transport layer

Cited by 16 publications

References 27 publications

Understanding the role of inorganic carrier transport layer materials and interfaces in emerging perovskite solar cells

Understanding the role of inorganic carrier transport layer materials and interfaces in emerging perovskite solar cells

Copper Bromide Hole Transport Layer for Stable and Efficient Perovskite Solar Cells

A cascade bilayer electron transport layer toward efficient and stable Ruddlesden‐Popper perovskite solar cells

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