Double-Helicene-Based Hole-Transporter for Perovskite Solar Cells with 22% Efficiency and Operation Durability

Ren, Ming; Wang, Jianan; Xie, Xinrui; Zhang, Jing; Wang, Peng

doi:10.1021/acsenergylett.9b01949

Cited by 59 publications

(39 citation statements)

References 42 publications

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“…Generally, the thermal stability of organic materials will be enhanced by improving the rigidity and planarity of the conjugated system [22] . In the present work, the coplanar π‐extended quinoxaline core is found to significantly increase the thermal stability of HTMs.…”

Section: Figurementioning

confidence: 58%

“…[19][20][21] Generally, the thermal stability of organic materials will be enhanced by improving the rigidity and planarity of the conjugated system. [22] In the present work, the coplanar pextended quinoxaline core is found to significantly increase the thermal stability of HTMs. The decomposition temperature (T d , 5 % mass loss; see Figure 1 c) for TQ4 (461 8C) is much higher than that of TQ3 (424 8C).…”

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confidence: 58%

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A Coplanar π‐Extended Quinoxaline Based Hole‐Transporting Material Enabling over 21 % Efficiency for Dopant‐Free Perovskite Solar Cells

et al. 2020

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Developing dopant‐free hole transporting materials (HTMs) is of vital importance for addressing the notorious stability issue of perovskite solar cells (PSCs). However, efficient dopant‐free HTMs are scarce. Herein, we improve the performance of dopant‐free HTMs featuring with a quinoxaline core via rational π‐extension. Upon incorporating rotatable or chemically fixed thienyl substitutes on the pyrazine ring, the resulting molecular HTMs TQ3 and TQ4 show completely different molecular arrangement as well as charge transporting capabilities. Comparing with TQ3, the coplanar π‐extended quinoxaline based TQ4 endows enriched intermolecular interactions and stronger π–π stacking, thus achieving a higher hole mobility of 2.08×10−4 cm2 V−1 s−1. It also shows matched energy levels and high thermal stability for application in PSCs. Planar n‐i‐p structured PSCs employing dopant‐free TQ4 as HTM exhibits power conversion efficiency (PCE) over 21 % with excellent long‐term stability.

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Section: Figurementioning

confidence: 58%

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confidence: 58%

A Coplanar π‐Extended Quinoxaline Based Hole‐Transporting Material Enabling over 21 % Efficiency for Dopant‐Free Perovskite Solar Cells

et al. 2020

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“…It clearly can be seen that the device encapsulated by UVCA with paraffin shows superior thermal stability, which retain ≈90% of its initial efficiency after annealed under 65 °C in the ambient environment with 40–60% RH for over 1000 h. At the same time, the efficiency of the UVCA without paraffin‐encapsulated device dropped rapidly. Several previous works showed that small molecule Spiro‐OMeTAD with a low intrinsic glass transition temperature would crystallize under thermal stress . The hole transport layer (Spiro‐OMeTAD) has been modified by conductive polymer poly(triarylamine), which is effective to improve the thermal stability of the device.…”

Section: Resultsmentioning

confidence: 99%

1000 h Operational Lifetime Perovskite Solar Cells by Ambient Melting Encapsulation

Yang

Wang

et al. 2020

Advanced Energy Materials

121

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Improving device lifetime is one of the critical challenges for the practical use of metal halide perovskite solar cells (PSCs), wherein a reliable encapsulation is indispensable. Herein, based on an in‐depth understanding of the degradation mechanism for the PSCs, a solvent‐free and low‐temperature melting encapsulation technique, by employing low‐cost paraffin as the encapsulant that is compatible with perovskite absorbers, is demonstrated. The encapsulation strategy enables the full encapsulating operations to be undertaken under an ambient environment. It is found that the strategy not only removes residual oxygen and moisture to prevent the perovskite from phase segregation, but also suppresses the species volatilization to impede absorber decomposition, enabling a PSC devices with good thermal and moisture stability. As a result, the as‐encapsulated PSCs achieve a 1000 h operational lifetime for the encapsulated device at continuous maximum power point output under an ambient environment. This work paves the way for scalable and robust encapsulation strategy feasible to hybrid perovskite optoelectronics in an economic manner.

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“…used chlorobenzene antisolvent dripping to fabricate triple cation mixed halide perovskite films. [ 87 ] Utilizing antisolvent treatment and a new kind of hole transport material N 3 , N 3 , N 6 , N 6 , N 11 , N 11 , N 14 , N 14 ‐octakis(4methoxyphenyl)dibenzo[g,p]chrysene‐3,6,11,14‐tetraamine (DBC‐OMeDPA), an efficiency of 22% has been achieved. In addition, Liu et al.…”

Section: Role Of Antisolvents To Improve the Perovskite Film Formationmentioning

confidence: 99%

Antisolvents in Perovskite Solar Cells: Importance, Issues, and Alternatives

Ghosh

Mishra

Singh

2020

Adv Materials Inter

120

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technologies based on crystalline silicon, cadmium telluride (CdTe), copper indium gallium selenide (CIGS), etc. [15,16] Tremendous efforts are being given to commercialization of PSCs through improving the device efficiency, stability, and ability to fabricate large-area perovskite films. Though the current efficiency of PSCs is comparable to other matured solar cell technologies, this technology is behind those in terms of stability and large-area fabrication ability. Hopefully, various technologies have come out as potential largearea film fabrication methods, like blade coating, spray coating, slot-die coating, roll printing, etc. [17-20] Furthermore, stability can be improved mostly by encapsulation technologies and using additives in precursor solutions, but still not up to the mark for commercial use, which leaves a huge space for further research. [15,21-24] At the beginning of the perovskite solar cell era, uniform and pinhole-free perovskite film formation was a challenge. It is notable that, pinholes lead to a decrease in shunt resistance and nonuniformity leads to an increase in series resistance, which ultimately produce poor efficiency and stability of the device. Gradually, various technologies had been developed to improve the overall film quality, i.e., to obtain uniform and fully covered films. Among those technologies, the use of antisolvents during the perovskite film formation became very successful to obtain uniform and pinhole-free film, which dramatically increased the efficiency of the devices (also improved the stability to some extent). Antisolvents induce rapid and dense nucleation of perovskite that lead to uniform and pinhole free films. [25] Other effective alternative technologies are additive engineering, [26] hot casting, [27] rapid thermal annealing, [28] and solvent annealing. [29,30] In additive engineering, additives are used generally to slow down the crystallization process of perovskite or defect passivation to improve the crystallinity and optoelectronic properties of the perovskite film. In hot casting, hot precursor solution is coated on a hot substrate for better crystallization that improves the perovskite film quality. In rapid thermal annealing, a high intensity radiation is applied for post-annealing of perovskite film. In solvent annealing, a solvent vapor is allowed to condense on the surface, voids, and grain boundaries of the film, in which the perovskite dissolve and recrystallize to reduce the grain boundaries and pinholes. Interestingly, the best efficiency solar cells are mostly fabricated by using antisolvents. Therefore, a review article on the use of Organic-inorganic metal halide perovskite solar cells are emerging as potential solar energy harvesting tools and can be a tough competitor to already matured solar cell technologies. The success of perovskite solar cells is attributed to superior optoelectronic properties of perovskites, feasible synthesis process, and low fabrication cost. Though perovskite solar cells confront perovskite film quality rela...

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Double-Helicene-Based Hole-Transporter for Perovskite Solar Cells with 22% Efficiency and Operation Durability

Cited by 59 publications

References 42 publications

A Coplanar π‐Extended Quinoxaline Based Hole‐Transporting Material Enabling over 21 % Efficiency for Dopant‐Free Perovskite Solar Cells

A Coplanar π‐Extended Quinoxaline Based Hole‐Transporting Material Enabling over 21 % Efficiency for Dopant‐Free Perovskite Solar Cells

1000 h Operational Lifetime Perovskite Solar Cells by Ambient Melting Encapsulation

Antisolvents in Perovskite Solar Cells: Importance, Issues, and Alternatives

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