Additive-assisted one-step formed perovskite/hole conducting materials graded heterojunction for efficient perovskite solar cells

Chen, Peng; Wang, Enqi; Yin, Xingtian; Que, Meidan; Gao, Bowen; Que, Wenxiu

doi:10.1016/j.jcis.2018.07.100

Cited by 20 publications

(6 citation statements)

References 36 publications

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“…Notably, the intermixed region may not be undesirable in every case. Devices and material systems where the interphase region provides distinct functionality, such as bulk heterojunction and graded heterojunction semiconductor devices, − may derive unique benefits from the slot-coating approach developed in this work.…”

Section: Resultsmentioning

confidence: 99%

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Parsekian

Harris

2019

ACS Appl. Mater. Interfaces

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Slot die coating has been established as an economical approach for deposition of parallel narrow stripes, a constituent pattern feature in many printed device applications. However, the minimum feature size that can be achieved using this approach is constrained by wetting and liquid bridge phenomena at the deposition region. We hypothesize that pattern resolution and process control can be improved by co-depositing a support fluid to stabilize the pattern. Electrically conductive poly(3,4ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is slot die-coated in parallel stripes on flexible poly(ethylene terephthalate) substrate, without wettability-enhancing dopants or substrate pretreatment. A miscible liquid phase, polyvinyl alcohol, is used as the support material. Feature size performance and conductivity of PEDOT:PSS stripe regions are evaluated across a range of process conditions. Narrow PEDOT:PSS stripes produced using our technique range from 400 to 850 μm and exhibit conductivity approaching 1.5 S cm −1 . This electrical performance falls within the upper range expected prior to standard conductivity-enhancing post-treatments. Significantly, dewetting effects normally present with undoped PEDOT:PSS on the plastic substrate are fully mitigated with our deposition technique. These results indicate high ease of processing and good feature size performance, with few inherent drawbacks to the functional properties of the patterned films.

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Section: Resultsmentioning

confidence: 99%

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Parsekian

Harris

2019

ACS Appl. Mater. Interfaces

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“…[77,115] However, the ability to manipu-late the band energetics within the film to modify the carrier collection is a key advantage of the GHJ and opens the door to new opportunities in band gap engineering of PSCs, following in the footsteps of mature PV technologies. [110,113,114,116,117] In this section, comparisons are first made between the similarities of the graded and un-graded (BHJ) approaches, such as the formation of large crystalline grains and stability improvements, before providing a discussion on the early progress into the new opportunities afforded by band gap engineering in GHJ architectures through forming a CTL concentration gradient such as the replacement of less stable HTLs.…”

Section: Blended Perovskite Graded Heterojunctionsmentioning

confidence: 99%

Device Architecture Engineering: Progress toward Next Generation Perovskite Solar Cells

Webb

Sweeney

Zhang

2021

Adv Funct Materials

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Over the past decade, perovskite solar cells (PSCs) have quickly established themselves as a promising technology boasting both high efficiency and low processing costs. The rapid development and success of PSCs is a product of substantial research effort addressing compositional engineering, thin film fabrication, surface passivation, and interfacial treatments. Recently, engineering of device architecture has entered a renaissance with the emergence of several new bulk and graded heterojunction structures. These structures promote a lateral approach to the development of single-junction PSCs affording new opportunities in light management, defect passivation, carrier extraction, and long-term stability. Following a short overview of the historic evolution of PSC architectures, a detailed discussion of the promising progress of the recently reported perovskite bulk heterojunction and graded heterojunction approaches are offered. To enable better understanding of these novel architectures, a range of approaches to characterizing the architectures are presented. Finally, an outlook and perspective are provided offering insights into the future development of PSC architecture engineering.

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“…Although adding additives in perovskite precursors could offer larger grains and fewer defects, the high concentration of additives implemented into perovskite films can lead to a negative effect on the electron and hole transport . On the other hand, bulk heterojunction structures offer random distribution of additives in perovskite films, which may lead to undesirable contact between electron/hole transport materials and perovskite film. − Moreover, since the defects of perovskite film are mostly located at the top surface, most efforts are needed to control defect passivation on the surface.…”

Section: Introductionmentioning

confidence: 99%

Antisolvent Additive Engineering for Boosting Performance and Stability of Graded Heterojunction Perovskite Solar Cells Using Amide-Functionalized Graphene Quantum Dots

Khorshidi

Rezaei

Kavousighahfarokhi

et al. 2022

ACS Appl. Mater. Interfaces

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Additive and antisolvent engineering strategies are outstandingly efficient in enhancing perovskite quality, photovoltaic performance, and stability of perovskite solar cells (PSCs). In this work, an effective approach is applied by coupling the antisolvent mixture and multi-functional additive procedures, which is recognized as antisolvent additive engineering (AAE). The graphene quantum dots functionalized with amide (AGQDs), which consists of carbonyl, amine, and long hydrophobic alkyl chain functional groups, are added to the antisolvent mixture of toluene (T) and hexane (H) as an efficient additive to form the CH3NH3PbI3 (MAPI):AGQDs graded heterojunction structure. A broad range of analytical techniques, including scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, space charge limited current, UV–visible spectroscopy, external quantum efficiency, and time-of-flight secondary ion mass spectrometry, are used to investigate the effect of AAE treatment with AGQDs on the quality of perovskite film and performance of the PSCs. Importantly, not only a uniform and dense perovskite film with hydrophobic property is obtained but also defects on the perovskite surface are significantly passivated by the interaction between AGQDs and uncoordinated Pb2+. As a result, an enhanced power conversion efficiency (PCE) of 19.10% is achieved for the champion PSCs treated with AGQD additive, compared to the PCE of 16.00% for untreated reference PSCs. In addition, the high-efficiency PSCs based on AGQDs show high stability and maintain 89% of their initial PCE after 960 h in ambient conditions.

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Additive-assisted one-step formed perovskite/hole conducting materials graded heterojunction for efficient perovskite solar cells

Cited by 20 publications

References 36 publications

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Device Architecture Engineering: Progress toward Next Generation Perovskite Solar Cells

Antisolvent Additive Engineering for Boosting Performance and Stability of Graded Heterojunction Perovskite Solar Cells Using Amide-Functionalized Graphene Quantum Dots

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