Platinum wire implants coated with PEDOT/carbon nanotube conducting polymer films in the brain of rats: A histological evaluation

Cheng, Xuan; Li, Chengyan; Rao, Li; Zhou, Haihan; Li, Tao; Duan, Yu

doi:10.1007/s11595-012-0599-8

Cited by 27 publications

(31 citation statements)

References 12 publications

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“…Due to recent breakthrough made in perovskite solar cells (PVSCs), [1][2] solution processable organic/inorganic hybrid halide perovskites have become one of the most promising photovoltaic materials for solar energy. [3][4][5][6][7][8][9][10][11][12][13][14] However, there are several critical concerns such as toxic lead (Pb) contaminant and stability that need to be addressed before PVSC can be considered for commercialization. So far, all of the high-performance PVSCs reported so far are mainly based on the organolead halide perovskite family (RPbX 3 , R = methylammonium (MA + )/formamidinium (FA + ); X = I -/Br -).…”

Section: Introductionmentioning

confidence: 99%

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

et al. 2017

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Realizing efficient organic/inorganic hybrid perovskite solar cells (PVSCs) with reduced toxic lead (Pb) content is important for developing sustainable clean photovoltaics. The vigorous progress made recently for tin (Sn)-and Pb/Sn-based PVSCs has drawn considerable attention because of their potential to reduce Pb content in perovskites. However, the inferior chemical stability of Sn to Pb element necessitates more sophisticated morphological and processing engineering of Sn-containing PVSCs in order to achieve high performance and stability. We have recently discovered that ascorbic acid (AA) can serve as a simple but effective additive to simultaneously enhance the performance and stability of Sn-containing PVSCs. It is revealed that AA as a commonly known antioxidant can retard the oxidation of Sn-containing precursor solution of perovskite while modulate its perovskite crystallization by forming intermediate complexes. This is evidenced by the prolonged photogenerated carrier lifetime (182.7 ns) of its derived MA 0.5 FA 0.5 Pb 0.5 Sn 0.5 I 3 film. As a result, a high PCE of 14.01% with improved stability can be realized in the binary metal PVSC with AA as additive, outperforming the value (12.18%) of the control device processed with the regular SnF 2 additive.

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Section: Introductionmentioning

confidence: 99%

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

et al. 2017

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“…Dai and co-workers [ 20 ] developed a layer-by-layer approach to form CH 3 NH 3 PbI 3-x Cl x perovskite, namely by depositing a thin PbCl 2 through vacuum evaporation, followed by exposure into MAI solution to form perovskite. To the best of our knowledge, a simple and effective method for fast conversion of PbI 2 fi lm into perovskite on fl at substrate via two-step sequential deposition process at room temperature has not been reported.…”

Section: Introductionmentioning

confidence: 99%

A Smooth CH₃NH₃PbI₃ Film via a New Approach for Forming the PbI₂ Nanostructure Together with Strategically High CH₃NH₃I Concentration for High Efficient Planar‐Heterojunction Solar Cells

Zhang

Mao

et al. 2015

Advanced Energy Materials

243

137

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to 20.1% [ 2,3 ] within fi ve years. The theoretical limit of the PVSC effi ciency has been estimated to be 31%, which is very close to the Shockley-Queisser limit (33%). [ 4 ] Perovskite deposition is crucial to produce high-effi ciency PVSCs. Generally, there are mainly three methods, including onestep solution spin-coating, vacuum vapor deposition, and two-step sequential deposition to prepare the hybrid perovskite fi lm. [5][6][7][8][9][10][11][12][13] Two-step sequential deposition has recently been reported, [ 7 ] which provides an effi cient and low-cost route to high-performance PVSCs.In a typical two-step sequential deposition of perovskites such as MAPbI 3 (MA = CH 3 NH 3 + ), PbI 2 is fi rst deposited on the substrate (mesoporous or planar scaffold) by spin-coating or vacuum evaporation, subsequently transformed into the perovskite (MAPbI 3 ) by exposing it to an anhydrous isopropanol (IPA) solution of MAI. For the two-step sequential deposition, the conversion and fi lm morphology of the fi nal perovskite fi lm strongly depend on the initial PbI 2 fi lm during the fi rst step of the process. [ 7,14,15 ] Conventionally, PbI 2 from dimethyl formamide (DMF) solution tends to form a layered and dense crystalline fi lm on a fl at substrate. However, the complete conversion of PbI 2 to perovskite on exposure to the MAI solution usually requires several hours. [ 7 ] However, this long reaction time in MAI solution could lead to the dissolution of perovskite fi lms. These drawbacks make it diffi cult to fabricate planar-structured PVSCs by sequential deposition method.Several strategies have been developed to solve this problem, including using elevated reaction temperature, [ 16,17 ] controlling the crystallization of PbI 2 by employing strong coordinative solvent of dimethyl sulfoxide [ 14 ] or using MAI vapor instead of MAI solution. [ 18 ] Recently, a cloudy PbI 2 fi lm prepared by gas-quenching treatment has been reported by Vak and co-workers, [ 19 ] which also enhances the conversion of PbI 2 to perovskites in the process of roll-to-roll fabrication. Zhao & Zhu [ 14 ] developed a new three-step sequential deposition process, where a unstable PbI 2 ·CH 3 NH 3 Cl precursor fi lm is fi rst deposited on the mesoporous TiO 2 substrate and followed by thermal decomposition to form PbI 2 fi lm; the PbI 2 fi lm The photovoltaic performance of perovskite solar cells (PVSCs) is extremely dependent on the morphology and crystallization of the perovskite fi lm, which is affected by the deposition method. In this work, a new approach is demonstrated for forming the PbI 2 nanostructure and the use of high CH 3 NH 3 I concentration which are adopted to form high-quality (smooth and PbI 2 residue-free) perovskite fi lm with better photovoltaic performances. On the one hand, self-assembled porous PbI 2 is formed by incorporating small amount of rationally chosen additives into the PbI 2 precursor solutions, which signifi cantly facilitate the conversion of perovskite without any PbI 2 residue. On the other hand, by...

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“…Hybrid organic-inorganic perovskite solar cells (PSCs) have been intensely studied since the technology was first reported 6 years ago. [1][2][3][4][5][6][7] In a PSC, organic-inorganic lead halide perovskites, such as CH 3 NH 3 PbI 3 (MAPbI 3 ), [3,8] CH 3 NH 3 PbI 3-x Cl x (MAPbI 3-x Cl x ) [1,9] and CH 3 NH 3 PbBr 3 (MAPbBr 3 ) [10,11] simultaneously act as light absorbing and charge transporting materials. The beneficial properties of these perovskite materials have resulted in power conversion efficiencies (PCEs) exceeding 20%.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of planar CH3NH3PbI3 perovskite solar cells revealed by light on/off diurnal cycling

et al. 2016

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Long-term stability represents a major challenge for the commercial deployment of hybrid perovskite solar cells (PSCs). The stability of solar cells is commonly tested under continuous illumination over extended periods of time, for example, 1000 hours. We have found that such a method does not adequately reflect the long-term performance of perovskite solar cells under the diurnal solar irradiation cycles experienced in real-world applications. We report a new characterization protocol of multiple 12-hour cycles of darkness and illumination, uncovering a unique 'fatigue' behavior of PSCs. The PSC efficiency was found to decrease to 50% or less of its maximum value after storage in the dark for 12 hours under open circuit conditions. The solar cell performance was capable of recovering to its maximum value in the subsequent 12-hour illumination period, but the recovery rate slowed significantly with successive illumination/darkness cycles. This fatigue mechanism was strongly dependent on the cell temperature. The identification of this fatigue behavior renders our proposed characterization protocol an essential component of perovskite solar cell testing.

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Platinum wire implants coated with PEDOT/carbon nanotube conducting polymer films in the brain of rats: A histological evaluation

Cited by 27 publications

References 12 publications

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

A Smooth CH₃NH₃PbI₃ Film via a New Approach for Forming the PbI₂ Nanostructure Together with Strategically High CH₃NH₃I Concentration for High Efficient Planar‐Heterojunction Solar Cells

Fatigue behavior of planar CH3NH3PbI3 perovskite solar cells revealed by light on/off diurnal cycling

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Platinum wire implants coated with PEDOT/carbon nanotube conducting polymer films in the brain of rats: A histological evaluation

Cited by 27 publications

References 12 publications

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells

A Smooth CH3NH3PbI3 Film via a New Approach for Forming the PbI2 Nanostructure Together with Strategically High CH3NH3I Concentration for High Efficient Planar‐Heterojunction Solar Cells

Fatigue behavior of planar CH3NH3PbI3 perovskite solar cells revealed by light on/off diurnal cycling

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A Smooth CH₃NH₃PbI₃ Film via a New Approach for Forming the PbI₂ Nanostructure Together with Strategically High CH₃NH₃I Concentration for High Efficient Planar‐Heterojunction Solar Cells