Crosslinked and dopant free hole transport materials for efficient and stable planar perovskite solar cells

Zhang, Yun; Kou, Chun; Zhang, Junjie; Liu, Yahui; Li, Wenhua; Bo, Zhishan; Shao, M.

doi:10.1039/c8ta12060a

Cited by 47 publications

(31 citation statements)

References 30 publications

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“…[ 25 ] In addition, recently cross‐linkable HTMs were introduced into inverted devices, resulting in relatively high performance. [ 26 ] However, it was achieved using palladium‐catalyzed reactions.…”

Section: Introductionmentioning

confidence: 99%

Enamine‐Based Cross‐Linkable Hole‐Transporting Materials for Perovskite Solar Cells

et al. 2020

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The development of the simple synthesis schemes of organic semiconductors can have an important contribution to the advancement of related technologies. In particular, one of the fields where the high price of the hole‐transporting materials may become an obstacle toward successful commercialization is perovskite solar cells. Herein, enamine‐based materials that are capable of undergoing cross‐linking due to the presence of two vinyl groups are synthesized. It is shown that new compounds can be thermally polymerized, making the films resistant to organic solvents. This can allow the use of a wet‐coating process for the deposition of the perovskite absorber film, without the need for orthogonal solvents. Cross‐linked films are used in perovskite solar cells, and, upon optimization of the film thickness, the highest power conversion efficiency of 18.1% is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Enamine‐Based Cross‐Linkable Hole‐Transporting Materials for Perovskite Solar Cells

et al. 2020

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“…Meanwhile, hysteresis free small scaled devices based on XY1 showed a competitive PCE of 18.78%. Further, several novel chemical structures of dopant‐free HTMs with moderate device data have been reported (summarized in Table 1 and 2) yet not discussed in detail here …”

Section: Organic Hole Transporting Materialsmentioning

confidence: 99%

Development of Dopant‐Free Organic Hole Transporting Materials for Perovskite Solar Cells

Pham

Yang

Jain

et al. 2020

Advanced Energy Materials

229

170

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There has been considerable progress over the last decade in development of the perovskite solar cells (PSCs), with reported performances now surpassing 25.2% power conversion efficiency. Both long‐term stability and component costs of PSCs remain to be addressed by the research community, using hole transporting materials (HTMs) such as 2,2′,7,7′‐tetrakis(N,N′‐di‐pmethoxyphenylamino)‐9,9′‐spirbiuorene(Spiro‐OMeTAD) and poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA). HTMs are essential for high‐performance PSC devices. Although effective, these materials require a relatively high degree of doping with additives to improve charge mobility and interlayer/substrate compatibility, introducing doping‐induced stability issues with these HTMs, and further, additional costs and experimental complexity associated with using these doped materials. This article reviews dopant‐free organic HTMs for PSCs, outlining reports of structures with promising properties toward achieving low‐cost, effective, and scalable materials for devices with long‐term stability. It summarizes recent literature reports on non‐doped, alternative, and more stable HTMs used in PSCs as essential components for high‐efficiency cells, categorizing HTMs as reported for different PSC architectures in addition to use of dopant‐free small molecular and polymeric HTMs. Finally, an outlook and critical assessment of dopant‐free organic HTMs toward commercial application and insight into the development of stable PSC devices is provided.

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“…Besides carbazole, another typical tricyclic unit fluorene which is a half of the spiro[bifluorene] core in spiro-OMeTAD was also applied as a building block of SM-HTMs, and almost all of them served in inverted PSCs. [90][91][92][93][94][95][96][97][98] Ding et al [97] constructed an HTM with a fluorene core and two methylthio (MeS)-group modified DPA arms through only two synthetic steps. The MeS group was beneficial for deepening the HOMO level of the molecule than MeO group, and the corresponding device demonstrated a PCE of 19.06%, much improved relative to that of PEDOT:PSS based one with a PCE of only 13.9%.…”

Section: Tricyclic Coresmentioning

confidence: 99%

A Review on Solution‐Processable Dopant‐Free Small Molecules as Hole‐Transporting Materials for Efficient Perovskite Solar Cells

et al. 2020

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Perovskite solar cells (PSCs) based on conventional hole‐transporting materials (HTMs) have achieved power conversion efficiencies comparable to those of typical inorganic solar cells; however, the dopants used to increase the hole mobility or the film‐forming ability impart these devices with a poor long‐term stability, blocking the industrial commercialization of PSCs. As an alternative, HTMs without any dopants are explored. Herein, dopant‐free small molecular HTMs (SM‐HTMs) are reviewed and the performance based on the analyses of their molecular structures are evaluated. A summary of the designing principle and an outlook of the development of highly efficient SM‐HTMs are presented.

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Crosslinked and dopant free hole transport materials for efficient and stable planar perovskite solar cells

Abstract: A series of crosslinked diphenylamine derivatives have been developed and employed as hole transport materials in inverted p–i–n planar perovskite solar cells, which exhibit the significantly improved device efficiency and stability.

Cited by 47 publications

References 30 publications

Enamine‐Based Cross‐Linkable Hole‐Transporting Materials for Perovskite Solar Cells

Enamine‐Based Cross‐Linkable Hole‐Transporting Materials for Perovskite Solar Cells

Development of Dopant‐Free Organic Hole Transporting Materials for Perovskite Solar Cells

A Review on Solution‐Processable Dopant‐Free Small Molecules as Hole‐Transporting Materials for Efficient Perovskite Solar Cells

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