Progress on the Synthesis and Application of CuSCN Inorganic Hole Transport Material in Perovskite Solar Cells

Perovskite solar cells (PSCs) exhibit the steepest growth in power conversion efficiency among the existing photovoltaic technologies. However, a wide range of factors restrict the commercial viability of PSCs as a renewable energy source. This article reviews the latest progress in PSC devices including innovative light‐harvesting perovskite materials and advanced interfacial layers, and the foremost challenges. The most promising remedial solutions to challenges are also discussed. For the realization of a high performing and eco‐friendly stabilized perovskite photovoltaic device, a combinational method involving multiple restorative solutions is required. A specific emphasis is given to unveiling interesting perovskite properties, and device fabrication approaches to the solutions. These remedies and strategies may help researchers to select appropriate methods and design their experiments to obtain a high photo‐conversion efficiency in photovoltaic devices with enhanced stability as compared to conventional photovoltaic devices.

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“…[ 185 ] Additionally, CuSCN has also been used in a regular‐architecture perovskite solar cell with 4.85% efficiency. [ 186 ]…”

Section: Perovskite Solar Cells: Device Architectures Materials and Electrodesmentioning

confidence: 99%

Emerging Perovskite Solar Cell Technology: Remedial Actions for the Foremost Challenges

Sahare

Pham

Angmo

et al. 2021

Advanced Energy Materials

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“…The main character in the copper family is undoubtedly copper thiocyanate, CuSCN, that displays all the good properties of a suitable HTM for PSCs [61] : decent hole mobility due to the quasimolecular structure given by the pseudohalide SCN À , [62] high bandgap (3.4-3.9 eV), p-type character (work function [WF] of 5.2 eV), hydrophobic nature and good solubility in organic solvents (mainly sulfides) and aqueous ammonia. [63] In this latter case, researchers demonstrate the possibility of integrating CuSCN in a water environment, paving the way to scalable manufacturing of PSCs using mild solvents and obtaining a remarkable PCE of 17.5%.…”

Section: Inorganic Htms For Pscsmentioning

confidence: 99%

The Non‐Innocent Role of Hole‐Transporting Materials in Perovskite Solar Cells

et al. 2021

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Spiro-OMeTAD (2,2 0 ,7,7 0 -tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9 0 -spirobifluorene, from now on simply Spiro) is the most used and applied hole-transporting material (HTM) in perovskite solar cells (PSCs). The reason is straightforward: after opportune formulation (i.e., addition of 4-tert-butylpyridine, tBP, and lithium bis(trifluoromethylsulfonyl)-imide, LiTFSI, as dopants/additives), the planar PSCs normally achieve the highest power conversion efficiencies (PCEs) at lab scale (up to 24%). [1] However, this result is strongly overestimated when compared with the longterm stability of the device: it has been already largely proved by several works that the necessary doping of the organic material augments the hygroscopic character of the layer, thus favoring moisture uptake from the atmosphere and subsequent perovskite film decomposition. [2,3] Combined with its notable cost (nowadays slightly decreasing due to the presence of more producers on the market), [4,5] we can assert that Spiro is only a model/benchmark HTM useful for lab-scale PSC production and testing. This is a pity indeed, because it possesses all the properties required for a good performing HTM: the high glass transition temperature due to the Spiro-type bond, the smooth film morphology that it forms, the relative simple processing, the electrochemical stability, the optical transparency in the visible window, the amorphous nature, the optimal band alignment with the perovskite valence band, and the chemical compatibility with dopants. Despite these very promising properties therefore, the high costs and very low inherent hole conductivity hugely reduce the possible commercialization of Spiro-based PSCs and force scientists to identify new avenues for obtaining long-term stability and for simplifying device processing methods.

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“…45 This limit has resulted in the use of inorganic HTM; for instance, copper (I) thiocyanate (CuSCN) due to its stability against moisture and heat. 46 Another charge selective layer that plays crucial roles for electron extraction from the CB of perovskite materials is ETL. The significant criteria needed in ETL layer are (i) high electron mobility for a substantial electronaccepting property, (ii) matching energy band where the CB or lowest unoccupied molecular orbital should be positioned slightly lower than that of perovskite materials so that the electron could be injected efficiently within ETL/perovskite interface, (refer Figure 2) (iii) hydrophobicity and chemical stability in order to enhance moistureresistant and prohibit unnecessary chemical reactions with other components in the device architecture.…”

Section: Working Principle and Device Componentsmentioning

confidence: 99%

“…ITO substrate was reported to be degrading when in direct contact with hygroscopic PSS that shows the capability to absorb moisture from the atmosphere, which limits the hole extraction through ITO/PEDOT:PSS interface 45 . This limit has resulted in the use of inorganic HTM; for instance, copper (I) thiocyanate (CuSCN) due to its stability against moisture and heat 46 …”

Section: Introductionmentioning

confidence: 99%

Recent progress of graphene‐based materials for efficient charge transfer and device performance stability in perovskite solar cells

et al. 2020

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Summary The relevance of graphene‐based materials throughout the niche area of perovskite solar cells (PSCs) is indeed the main focus of this review. Specific properties of two types of solar cell materials, namely hybrid perovskites and graphene‐based materials are at the core of significant breakthroughs in a wide range of applications. The specific features of graphene‐based materials, along with their unique properties, have been utilized mainly in the development of photovoltaic devices. PSCs are known to have promising device performance and surpass other third‐generation solar cells, including organic photovoltaics, quantum dot solar cells, and dye‐sensitized solar cells. However, PSCs address several limitations in the device mechanism and material stability. PSCs performance tends to deplete over time due to several factors such as the degradation of materials used in the device caused by exposure of thermal and moisture, as well as an undesired chemical reaction in the interfaces. Several experimental studies, especially on the integration of carbon materials, including the graphene, have been extensively explored. The integration of graphene‐based materials is one of the potential methods for altering and modifying components in PSCs, including perovskite structure and charges transport layers. Therefore, this review gives an overview of recent progress in the development of PSCs with the integration of graphene‐based materials. The emphasis will be on the influence brought by graphene‐based materials on the charge transport mechanism at the interfaces and perovskite morphology toward the improvement of photovoltaic performance and stability.

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Progress on the Synthesis and Application of CuSCN Inorganic Hole Transport Material in Perovskite Solar Cells

Cited by 48 publications

References 85 publications

Emerging Perovskite Solar Cell Technology: Remedial Actions for the Foremost Challenges

Emerging Perovskite Solar Cell Technology: Remedial Actions for the Foremost Challenges

The Non‐Innocent Role of Hole‐Transporting Materials in Perovskite Solar Cells

Recent progress of graphene‐based materials for efficient charge transfer and device performance stability in perovskite solar cells

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