Passivation functionalized phenothiazine-based hole transport material for highly efficient perovskite solar cell with efficiency exceeding 22%

Ding, Xingdong; Wang, Haoxin; Chen, Cheng; Li, Hongping; Tian, Yi; Li, Qijun; Wu, Cheng; Ding, Liming; Yang, Xichuan; Cheng, Ming

doi:10.1016/j.cej.2020.128328

Cited by 94 publications

(57 citation statements)

References 43 publications

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“…ⅱ ) The NH units passivates the perovskite surface, leading to a perovskite layer with good quality and crystallinity; ⅲ) The NH groups form Pb-N coordination-bonds between the top-coordinated Pb atoms at the interface, which can significantly improve the hole extraction rate. 28 In this work, the p-i-n PSCs employing a hydrogen-bonded dopant-free HTM achieved a champion PCE of 21.62%, which is comparable with the recent highest PCE records. 44 Page 14 of 24 CCS Chemistry…”

Section: Figure 2 | Afm Images Of (A) Tpadpp-boc and (B) Tpadpp Thin Films On Ito Contact Angles Of (C) Tpadpp-boc And (D) Tpadpp Films Wsupporting

confidence: 78%

“…DPP is the most widely used chromophore in OFETs, which enables extremely high hole mobility, 19,26 and TPA is a popular unit to build high-performance HTMs. [27][28][29][30][31] In the designed molecule, the t-Boc units could be easily decomposed into carbon dioxide and isobutylene gas upon thermal annealing process, 32 meanwhile the N-H units has emerged and the hydrogen bonded TPADPP is formed between the N-H units and the C=O units from the neighboring DPP core (Figure 1). The application of solution-processable hydrogen bonded dopant-free HTMs is studied in this work.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen-Bonded Dopant-Free Hole Transport Material Enables Efficient and Stable Inverted Perovskite Solar Cells

Liu

Vivo

et al. 2022

CCS Chem

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Section: Figure 2 | Afm Images Of (A) Tpadpp-boc and (B) Tpadpp Thin Films On Ito Contact Angles Of (C) Tpadpp-boc And (D) Tpadpp Films Wsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Hydrogen-Bonded Dopant-Free Hole Transport Material Enables Efficient and Stable Inverted Perovskite Solar Cells

Liu

Vivo

et al. 2022

CCS Chem

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“…[8,[13][14][15][16] Recently, some works started to integrate this feature in the charge transport layer (CTL) above the perovskite to combine i) interaction with the perovskite surface and ii) charge transport and extraction within one material, thus removing one additional interface. [17][18][19][20][21] All these works have in common the functionalization of perovskite with molecules that bind to the undercoordinated Pb ions. Instead, to our knowledge, no reports exist on exploiting noncovalent interactions between CTLs and the iodide ions on the perovskite surface, of which halogen bonding [22] is a fascinating case.…”

Section: Introductionmentioning

confidence: 99%

Halogen‐Bonded Hole‐Transport Material Suppresses Charge Recombination and Enhances Stability of Perovskite Solar Cells

Canil

Salunke

Wang

et al. 2021

Advanced Energy Materials

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Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole‐transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo‐functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not‐interacting counterpart. Moreover, PFI devices show suppressed nonradiative recombination and reduced hysteresis, with a Voc enhancement of ≥20 mV and a remarkable stability, retaining more than 90% efficiency after 550 h of continuous maximum‐power‐point tracking. This work highlights the potential that XB can bring to the context of PSCs, paving the way for a new halo‐functional design strategy for charge‐transport layers, which tackles the challenges of charge transport and interface improvement simultaneously.

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“… 3 − 6 Particularly, hole transport layers (HTLs) have been shown to be critical in determining both the PCE and the lifetime of PSCs. 7 , 8 The highest-performing HTLs are organic materials that have lower hole mobilities compared to inorganic perovskites. This mobility mismatch in most cases results in charge accumulation at the interface between perovskite and HTL, eventually leading to undesired recombination losses.…”

mentioning

confidence: 99%

Suppressing PEDOT:PSS Doping-Induced Interfacial Recombination Loss in Perovskite Solar Cells

et al. 2022

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PEDOT:PSS is widely used as a hole transport layer (HTL) in perovskite solar cells (PSCs) due to its facile processability, industrial scalability, and commercialization potential. However, PSCs utilizing PEDOT:PSS suffer from strong recombination losses compared to other organic HTLs. This results in lower open-circuit voltage ( V OC ) and power conversion efficiency (PCE). Most studies focus on doping PEDOT:PSS to improve charge extraction, but it has been suggested that a high doping level can cause strong recombination losses. Herein, we systematically dedope PEDOT:PSS with aqueous NaOH, raising its Fermi level by up to 500 meV, and optimize its layer thickness in p-i-n devices. A significant reduction of recombination losses at the dedoped PEDOT:PSS/perovskite interface is evidenced by a longer photoluminescence lifetime and higher magnitude of surface photovoltage, leading to an increased device V OC , fill factor, and PCE. These results provide insights into the relationship between doping level of HTLs and interfacial charge carrier recombination losses.

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Passivation functionalized phenothiazine-based hole transport material for highly efficient perovskite solar cell with efficiency exceeding 22%

Cited by 94 publications

References 43 publications

Hydrogen-Bonded Dopant-Free Hole Transport Material Enables Efficient and Stable Inverted Perovskite Solar Cells

Hydrogen-Bonded Dopant-Free Hole Transport Material Enables Efficient and Stable Inverted Perovskite Solar Cells

Halogen‐Bonded Hole‐Transport Material Suppresses Charge Recombination and Enhances Stability of Perovskite Solar Cells

Suppressing PEDOT:PSS Doping-Induced Interfacial Recombination Loss in Perovskite Solar Cells

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