Hole‐Transporting Materials Based on Twisted Bimesitylenes for Stable Perovskite Solar Cells with High Efficiency

Lin, Yan Duo; Ke, Bo Yu; Lee, Kun‐Mu; Chang, Shih-Yu; Wang, Kai-Hung; Huang, Shih Han; Wu, Chun Guey; Chou, Po Ting; Jhulki, Samik; Moorthy, Jarugu Narasimha; Chang, Yuan Jay; Liau, Kang Ling; Chung, Hsin Cheng; Liu, Ching Yang; Sun, Shih‐Sheng; Chow, Tahsin J.

doi:10.1002/cssc.201501392

Cited by 48 publications

(20 citation statements)

References 38 publications

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“…The hole‐transporting material Spiro‐OMeTAD has been shown to crystallize over time, and this process is accelerated at higher temperatures, even though the glass transition temperature (125 °C) is well above the operating conditions . Several novel hole transporting materials have been introduced in the last years, of which many show an improved stability of the device under operating conditions, generally achieved by either increasing the glass transition temperature or by cross‐linking the HTM . We further note that the loss in performance is often related to the use of additives like Li‐TFSI, tert ‐butylpyridine ( t BP), and Co‐complexes, necessary to oxidize the HTM and achieve high enough conductivities to ensure balanced charge extraction and maximum device performance .…”

Section: Long‐term Viability: Stability and Sustainabilitymentioning

confidence: 89%

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Petrus

Schlipf

Cheng

et al. 2017

Advanced Energy Materials

312

201

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following statement: These materials can be processed from solution and yet exhibit optoelectronic materials properties described in classic solid-state physics textbooks. This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.The road towards these achievements has been marked by a constant improvement of perovskite deposition techniques fueled by our increasing understanding of the crystallization processes. The choice of deposition technique, either from solution or vapor, and the composition and order in which precursor species are applied has a great influence on the crystallization kinetics. Here, one can distinguish one-step methods where the perovskite is formed from a precursor mixture dissolved in a common solution, and two-step methods where the inorganic compound is deposited first and transformed to the perovskite phase later by addition of the organic constituents. [9][10][11] Furthermore, many parameters during processing can have an effect on the crystallization mechanism and consequently on film morphology, such as the choice of solvents, concentrations and processing additives that are often not incorporated into the final product. [11][12][13] We discuss this aspect in Section 2, where we focus our attention on the most commonly employed solution-based techniques. Additionally, as for any new technology trying to displace an incumbent technology, higher efficiencies, lower costs, reproducibility, stability, and sustainability are paramount. In particular, reproducibility has been a major challenge in perovskite solar cells from the beginning: small variations in morphology, like crystal size, film roughness, and pinholes can have detrimental effects on photovoltaic performance. [14] On the other hand, current-voltage measurements often showed a hysteresis that is rarely seen in other photovoltaic technologies. [15] These topics are highlighted in Sections 3 and 4. Finally, in Section 5 we discuss the framework for market introduction, such as cost reduction by choosing low-cost charge transport layers, or how the lifetime of perovskite absorbers can be extended by the choice of materials composition.Hybrid metal halide perovskites have become one of the hottest topics in optoelectronic materials research in recent years. Not only have they surpassed everyone's expectations and achieved similar performance as tried and true polycrystalline silicon photovoltaic devices, but they are also finding applications in a variety of different fields, including lighting. The main advantages of hybrid metal halide perovskites are simple processability, compatible with large-scale solution processing such as roll-to-roll printing, a...

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Section: Long‐term Viability: Stability and Sustainabilitymentioning

confidence: 89%

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Petrus

Schlipf

Cheng

et al. 2017

Advanced Energy Materials

312

201

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“…As seen from this data, both J sc and FF were slightly lower in comparison with the average parameters of the device using Spiro‐OMeTAD. Many studies have pointed out that the faster hole mobility is responsible for the greater short‐circuit density and higher fill factor of PSC. This coincided with the drift mobility values for V997 and Spiro‐OMeTAD.…”

Section: Methodsmentioning

confidence: 99%

Amorphous Hole‐Transporting Material based on 2,2′‐Bis‐substituted 1,1′‐Biphenyl Scaffold for Application in Perovskite Solar Cells

Magomedov

Sakai

Kamarauskas

et al. 2017

Chemistry An Asian Journal

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Perovskite solar cells are considered a promising technology for solar-energy conversion, with power conversion efficiencies currently exceeding 20 %. In most of the reported devices, Spiro-OMeTAD is used for positive-charge extraction and transport layer. Although a number of alternative hole-transporting materials with different aromatic or heteroaromatic fragments have already been synthesized, a cheap and well-performing hole-transporting material is still in high demand. In this work, a two-step synthesis of a carbazole-based hole-transporting material is presented. Synthesized compounds exhibited amorphous nature, good solubility and thermal stability. The perovskite solar cells employing the newly synthesized material generated a power conversion efficiency of 16.5 % which is slightly lower than that obtained with Spiro-OMeTAD (17.5 %). The low-cost synthesis and high performance makes our hole-transport material promising for applications in perovskite-based optoelectronic devices.

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“…Some studies have demonstrated that the high ll factor of PSC originates from the fast hole mobility. 38,39 In the previous section, it was mentioned that reorganization energy of the ortho position is higher than that of the para and meta positions, resulting in a negative contribution to the hole mobility of the ortho. However, the two properties of transfer integral and reorganization energy offset each other.…”

Section: Exciton Binding Energies and Charge-transfer Integralsmentioning

confidence: 99%

How the change of OMe substituent position affects the performance of spiro-OMeTAD in neutral and oxidized forms: theoretical approaches

Ashassi-Sorkhabi

Salehi-Abar

2018

RSC Adv.

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Hole‐Transporting Materials Based on Twisted Bimesitylenes for Stable Perovskite Solar Cells with High Efficiency

Cited by 48 publications

References 38 publications

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Amorphous Hole‐Transporting Material based on 2,2′‐Bis‐substituted 1,1′‐Biphenyl Scaffold for Application in Perovskite Solar Cells

How the change of OMe substituent position affects the performance of spiro-OMeTAD in neutral and oxidized forms: theoretical approaches

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