Organometal Halide Perovskites for Photovoltaic Applications

Bai, Sai; Jin, Yizheng; Gao, Feng

doi:10.1002/9781118998977.ch13

Cited by 9 publications

(8 citation statements)

References 99 publications

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“…Although the inverted planar of perovskite solar cells based on PEDOT:PSS hole transport layer showed promising efficiency, there are still several challenges need to overcome for achieving higher efficiencies. , The growth of perovskite film on PEDOT:PSS often leads to pinhole generation and incomplete surface coverage resulting in low device performance. , Recent results show that perovskite growth is strongly dependent on the bottom substrates. We have showed that NiO x could yield a better perovskite film than on PEDOT:PSS and give higher V oc .…”

Section: Film Growth For Improving Efficiency Of Inverted Planar Sola...mentioning

confidence: 99%

“…3,11 The growth of perovskite film on PEDOT:PSS often leads to pinhole generation and incomplete surface coverage resulting in low device performance. 3,11 Recent results show that perovskite growth is strongly dependent on the bottom substrates. We have showed that NiO x could yield a better perovskite film than on PEDOT:PSS and give higher V oc .…”

Section: Inverted Planar Solar Cellsmentioning

confidence: 99%

“…Inorganic–organic hybrid perovskite solar cells have attracted great attention due to their solution processing and high performance. , Organic halide perovskites have ABX 3 crystal structures, where A, B, and X are organic cation, metal cation and halide anion, respectively (Figure a), where the band gap can be tuned from the ultraviolet to infrared region through varying these components (Figure b). − This family of materials exhibits a myriad of properties ideal for PV such as high dual electron and hole mobility, large absorption coefficients resulting from sp antibonding coupling, a favorable band gap, a strong defect tolerance and shallow point defects, benign grain boundary recombination effects, and reduced surface recombination . After 6 years of efforts, the power conversion efficiency (PCE) of perovskite solar cells has risen from about 3% to over 20%, ,− which is close to that of traditional solar cell technologies such as Si, CIGS, and CdTe.…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in the Inverted Planar Structure of Perovskite Solar Cells

et al. 2015

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Inorganic-organic hybrid perovskite solar cells research could be traced back to 2009, and initially showed 3.8% efficiency. After 6 years of efforts, the efficiency has been pushed to 20.1%. The pace of development was much faster than that of any type of solar cell technology. In addition to high efficiency, the device fabrication is a low-cost solution process. Due to these advantages, a large number of scientists have been immersed into this promising area. In the past 6 years, much of the research on perovskite solar cells has been focused on planar and mesoporous device structures employing an n-type TiO2 layer as the bottom electron transport layer. These architectures have achieved champion device efficiencies. However, they still possess unwanted features. Mesoporous structures require a high temperature (>450 °C) sintering process for the TiO2 scaffold, which will increase the cost and also not be compatible with flexible substrates. While the planar structures based on TiO2 (regular structure) usually suffer from a large degree of J-V hysteresis. Recently, another emerging structure, referred to as an "inverted" planar device structure (i.e., p-i-n), uses p-type and n-type materials as bottom and top charge transport layers, respectively. This structure derived from organic solar cells, and the charge transport layers used in organic photovoltaics were successfully transferred into perovskite solar cells. The p-i-n structure of perovskite solar cells has shown efficiencies as high as 18%, lower temperature processing, flexibility, and, furthermore, negligible J-V hysteresis effects. In this Account, we will provide a comprehensive comparison of the mesoporous and planar structures, and also the regular and inverted of planar structures. Later, we will focus the discussion on the development of the inverted planar structure of perovskite solar cells, including film growth, band alignment, stability, and hysteresis. In the film growth part, several methods for obtaining high quality perovskite films are reviewed. In the interface engineering parts, the effect of hole transport layer on subsequent perovskite film growth and their interface band alignment, and also the effect of electron transport layers on charge transport and interface contact will be discussed. As concerns stability, the role of charge transport layers especially the top electron transport layer in the devices stability will be concluded. In the hysteresis part, possible reasons for hysteresis free in inverted planar structure are provided. At the end of this Account, future development and possible solutions to the remaining challenges facing the commercialization of perovskite solar cells are discussed.

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Section: Film Growth For Improving Efficiency Of Inverted Planar Sola...mentioning

confidence: 99%

Section: Inverted Planar Solar Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Advances in the Inverted Planar Structure of Perovskite Solar Cells

et al. 2015

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“…Therefore, the one-step method is easier to perform and is in line with the scale-up of the technology, and therefore adopted in this work. Regardless of the method of deposition, the perovskite crystallization process is usually controlled by cooling/heating and/or solvent engineering through the application of proper solvents and additives to manipulate the solubility limit and the solvent evaporation rate [8][9][10][11][12][13][14][15][16][17][18][19]. For improved device performance, many works employ additional interfacial layers, as well.…”

Section: Introductionmentioning

confidence: 99%

Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance

2018

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Abstract:In this work, a novel, facile, and low-cost mechanical post treatment technique, i.e., ultrasonic substrate vibration post treatment (SVPT) is applied on wet spun perovskite layers. The effect of varying the time of the SVPT on the characteristics of the perovskite crystals and the perovskite film is studied, in order to achieve the optimum time duration of the SVPT. Among the results, it is found that the application of only three minutes of the SVPT (for the ultrasonic vibration assembly used in this study, operated at 40 kHz) brings about significant improvement in the film coverage, and the contact between the perovskite and the m-TiO 2 layers, owing to the effective penetration of the perovskite solution into the pores, leading to a superior charge transfer, and a significant increase in the device power conversion efficiency (PCE), when compared to the control device. This unprecedented effect is repeatable when applied on both single and mixed halide perovskites, putting forward a reliable and low-cost mechanical technique for the fabrication of perovskite solar cells (PSCs) in the lab and beyond, which could reduce or eliminate the tedious and expensive chemical optimization treatments, commonly used to increase the PCE.

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“…Organic–inorganic hybrid perovskite solar cells (PvSCs) have attracted the attention of many researchers in the past few years because of their capabilities in achieving high efficiency through solution-fabrication of low-cost materials. , These materials exhibit excellent optoelectronic properties such as strong optical absorption coefficient, − long carrier lifetime (∼1 μs), and high carrier mobility (∼1 × 10 cm 2 V –1 s –1 ) . The band gap of perovskite can be tailored in the range from the ultraviolet to infrared region through varying components. ,, Most importantly, the excited organic–inorganic lead halide perovskite yield the loosely bonded Wannier excitons (bonding energy of ∼25 meV), which can easily dissociate into free charges on the costs of tiny thermal dynamic driven. Therefore, PvSCs can be made into versatile device architectures including mesoscopic and planar heterojunction structures. , Typically, organic/inorganic electron and hole transport layers (ETL and HTL), such as 2,2′7,7′-tetrakis(N,N-di- p -methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD), , fullerene (C 60 ), , [6,6]-phenyl C61-butyric acid methyl ester (PCBM) , and conjugated polymers as well as metal oxides, are frequently employed to form heterojunction with perovskite layer generating highly efficient photovoltaic effect.…”

Section: Introductionmentioning

confidence: 99%

Fulleropyrrolidinium Iodide As an Efficient Electron Transport Layer for Air-Stable Planar Perovskite Solar Cells

Huang¹,

Yu²,

Xie³

et al. 2016

ACS Appl. Mater. Interfaces

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Organic-inorganic halide perovskite solar cells have attracted great attention in recent years. But there are still a lot of unresolved issues related to the perovskite solar cells such as the phenomenon of anomalous hysteresis characteristics and long-term stability of the devices. Here, we developed a simple three-layered efficient perovskite device by replacing the commonly employed PCBM electrical transport layer with an ultrathin fulleropyrrolidinium iodide (C-bis) in an inverted p-i-n architecture. The devices with an ultrathin C-bis electronic transport layer yield an average power conversion efficiency of 13.5% and a maximum efficiency of 15.15%. Steady-state photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurements show that the high performance is attributed to the efficient blocking of holes and high extraction efficiency of electrons by C-bis, due to a favorable energy level alignment between the CHNHPbI and the Ag electrodes. The hysteresis effect and stability of our perovskite solar cells with C-bis become better under indoor humidity conditions.

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Organometal Halide Perovskites for Photovoltaic Applications

Cited by 9 publications

References 99 publications

Recent Advances in the Inverted Planar Structure of Perovskite Solar Cells

Recent Advances in the Inverted Planar Structure of Perovskite Solar Cells

Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance

Fulleropyrrolidinium Iodide As an Efficient Electron Transport Layer for Air-Stable Planar Perovskite Solar Cells

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