Acidity Suppression of Hole Transport Layer via Solution Reaction of Neutral PEDOT:PSS for Stable Perovskite Photovoltaics

Kim, Minseong; Yi, Minji; Jang, Woongsik; Kim, Jung Kyu; Wang, Dong Hwan

doi:10.3390/polym12010129

Cited by 27 publications

(25 citation statements)

References 66 publications

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“…It is well known that OSCs with PEDOT:PSS are very vulnerable to degradation due to the acidic nature of the HEL, which deteriorates the adjacent active layer polymer and fullerene derivatives. [19][20][21][22][23][24] In line with these studies, devices with PEDOT:PSS showed unstable J SC and FF, which decreased by 70% and 29%, resulting in a PCE drop of 80%, aer 2 days. Aer 4 days of degradation, the PCE showed a total decrease of 87%.…”

Section: Resultsmentioning

confidence: 63%

“…However, because of the acidic nature of PEDOT:PSS, it is also well known that PEDOT:PSS deteriorates the adjacent layers, resulting in poor device stability. [19][20][21][22][23][24] Furthermore, the unignorable absorption hurdles prevent realization of the potential efficiency of OSCs. 25,26 Transition metal oxides (TMOs) are also a good option for HELs.…”

Section: Introductionmentioning

confidence: 99%

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Study on graphene oxide as a hole extraction layer for stable organic solar cells

et al. 2021

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Study on graphene oxide as a hole extraction layer for stable organic solar cells

et al. 2021

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“…The fast degradation of the PEDOT:PSS-only device could be due to its acidic [58,59] and hygroscopic [60] nature, decaying the transparent conducting oxide (FTO) and/or the photoactive layer, which is sensitive to moisture. It could also be a result of morphological inhomogeneity with rougher interfaces.…”

Section: Performance Of Fabricated Perovskite Solar Cellsmentioning

confidence: 99%

A Hybrid Hole Transport Layer for Perovskite-Based Solar Cells

et al. 2021

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This paper presents the effect of a composite poly(3,4-ethylenedioxythiophene) polystyrene sulfonate PEDOT:PSS and copper-doped nickel oxide (Cu:NiOx) hole transport layer (HTL) on the performance of perovskite solar cells (PSCs). Thin films of Cu:NiOx were spin-coated onto fluorine-doped tin oxide (FTO) glass substrates using a blend of nickel acetate tetrahydrate, 2-methoxyethanol and monoethanolamine (MEA) and copper acetate monohydrate. The prepared solution was stirred at 65 °C for 4 h and spin-coated onto the FTO substrates at 3000 rpm for 30 s in a nitrogen glovebox. The Cu:NiOx/FTO/glass structure was then annealed in air at 400 °C for 30 min. A mixture of PEDOT:PSS and isopropyl alcohol (IPA) (in 1:0.05 wt%) was spun onto the Cu:NiOx/FTO/glass substrate at 4000 rpm for 60 s. The multilayer structure was annealed at 130 °C for 15 min. Subsequently, the perovskite precursor (0.95 M) of methylammonium iodide (MAI) to lead acetate trihydrate (Pb(OAc)2·3H2O) was spin-coated at 4000 rpm for 200 s and thermally annealed at 80 °C for 12 min. The inverted planar perovskite solar cells were then fabricated by the deposition of a photoactive layer (CH3NH3PbI3), [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and a Ag electrode. The mechanical behavior of the device during the fabrication of the Cu:NiOx HTL was modeled with finite element simulations using Abaqus/Complete Abaqus Environment CAE. The results show that incorporating Cu:NiOx into the PSC device improves its density–voltage (J–V) behavior, giving an enhanced photoconversion efficiency (PCE) of ~12.8% from ~9.8% and ~11.5% when PEDOT:PSS-only and Cu:NiOx-only are fabricated, respectively. The short circuit current density Jsc for the 0.1 M Cu:NiOx and 0.2 M Cu:NiOx-based devices increased by 18% and 9%, respectively, due to the increase in the electrical conductivity of the Cu:NiOx which provides room for more charges to be extracted out of the absorber layer. The increases in the PCEs were due to the copper-doped nickel oxide blend with the PEDOT:PSS which enhanced the exciton density and charge transport efficiency leading to higher electrical conductivity. The results indicate that the devices with the copper-doped nickel oxide hole transport layer (HTL) are slower to degrade compared with the PEDOT:PSS-only-based HTL. The finite element analyses show that the Cu:NiOx layer would not extensively deform the device, leading to improved stability and enhanced performance. The implications of the results are discussed for the design of low-temperature solution-processed PSCs with copper-doped nickel oxide composite HTLs.

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“…Similarly, PSCs with PEDOT:PSS as HTM often prepared in high acidity conditions results in device distortion. 44 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.…”

Section: Working Principle and Device Componentsmentioning

confidence: 99%

“…The dopant reported tends to introduce moisture to the perovskite material due to its corrosive and hygroscopic nature. Similarly, PSCs with PEDOT:PSS as HTM often prepared in high acidity conditions results in device distortion 44 . 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 .…”

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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Acidity Suppression of Hole Transport Layer via Solution Reaction of Neutral PEDOT:PSS for Stable Perovskite Photovoltaics

Cited by 27 publications

References 66 publications

Study on graphene oxide as a hole extraction layer for stable organic solar cells

Study on graphene oxide as a hole extraction layer for stable organic solar cells

A Hybrid Hole Transport Layer for Perovskite-Based Solar Cells

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

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