Stabilization of hybrid perovskite CH3NH3PbI3thin films by graphene passivation

Tseng, W. F.; Jao, Meng Huan; Hsu, Chang-Hong; Huang, Jing; Wu, Chih I.; Yeh, N.-C.

doi:10.1039/c7nr06510h

Cited by 16 publications

(12 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The C‐1s peak for the bare perovskite film consists of a pair of peaks with the main peak located at higher binding energies (≈286 eV) than that of the graphene. This location is consistent with previous XPS works on perovskite . The higher binding energy can be attributed to the CN bond in the CH 3 NH 3 − ion .…”

Section: Resultssupporting

confidence: 92%

“…In fact, increasing efforts have been made to incorporate graphene and other 2D layered materials in perovskite solar cells and optoelectronic devices . Graphene transferred on top of the perovskite can also passivate the moisture‐sensitive perovskite layer to improve the long‐term stability of the device …”

Section: Introductionmentioning

confidence: 99%

“…As a result, a graphene‐on‐perovskite interface cannot be formed by the wet method. Nonaqueous solvents have been used to transfer graphene on perovskite, but attaching free‐standing graphene, floating on top of a liquid, to the graphene receiving substrate is technically challenging and is difficult to scale up. Various dry transfer methods using thermal release tape or polydimethylsiloxane have been developed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scalable Graphene‐on‐Organometal Halide Perovskite Heterostructure Fabricated by Dry Transfer

Qin

Kattel

Kafle

et al. 2018

Adv Materials Inter

View full text Add to dashboard Cite

Graphene, a single layer conductor, can be combined with other functional materials for building efficient optoelectronic devices. However, transferring large‐area graphene onto another material often involves dipping the material into water and other solvents. This process is incompatible with water‐sensitive materials such as organometal halide perovskites. Here, a dry method is used and succeeded, for the first time, in stacking centimeter‐sized graphene directly onto methylammonium lead iodide thin films without exposing the perovskite film to any liquid. Photoemission spectroscopy and nanosecond time‐resolved photoelectrical measurement show that the graphene/perovskite interface does not contain significant amount of contaminants and sustain efficient interfacial electron transfer. The use of this method in fabricating graphene‐on‐perovskite photodetectors is further demonstrated. Besides a better photoresponsivity compared to detectors fabricated by the conventional perovskite‐on‐graphene structure, this dry transfer method provides a scalable pathway to incorporate graphene in multilayer devices based on water‐sensitive materials.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Scalable Graphene‐on‐Organometal Halide Perovskite Heterostructure Fabricated by Dry Transfer

Qin

Kattel

Kafle

et al. 2018

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Other useful characterization methods include ultraviolet photoelectron spectroscopy (UPS) for measuring the work function of VG-GNs [176,177], which provides useful information about the doping level of the graphene nanostructures; wettability studies, where the contact angle of a water droplet on the VG-GN sample is determined [72,74]; surface area measurements via nitrogen adsorption Brunauer-Emmett-Teller (BET) method [178]; and electrical transport measurements that determine the resistivity, carrier concentration and electron mobility [61,179,180]. In addition, certain application-specific characterizations, such as the cyclic voltammetry measurements, are carried out to evaluate the performance for energy storage applications.…”

Section: Characterizationmentioning

confidence: 99%

“…Therefore, it is important to develop proper transfer methods to remove graphene sheets and graphene nanostructures from their growth substrates to other desirable surfaces and/or devices while preserving the quality of the material. In the case of graphene sheets grown on metallic substrates, existing processes for transferring graphene from the growth substrates to other surfaces include three types of approaches: polymer-supported methods [243][244][245][246], polymer-free/water-assisted methods [247][248][249], and a polymer-free/water-free method [177]. While each approach has its specific strengths and shortcomings, all transfer methods involve chemical etching of the metallic substrates, which is environmentally undesirable.…”

Section: Sample Transfer Technologymentioning

confidence: 99%

Single-step growth of graphene and graphene-based nanostructures by plasma-enhanced chemical vapor deposition

et al. 2019

Self Cite

View full text Add to dashboard Cite

The realization of many promising technological applications of graphene and graphenebased nanostructures depends on the availability of reliable, scalable, high-yield and low-cost synthesis methods. Plasma enhanced chemical vapor deposition (PECVD) has been a versatile technique for synthesizing many carbon-based materials, because PECVD provides a rich chemical environment, including a mixture of radicals, molecules and ions from hydrocarbon precursors, which enables graphene growth on a variety of material surfaces at lower temperatures and faster growth than typical thermal chemical vapor deposition (T-CVD). Here we review recent advances in the PECVD techniques for synthesis of various graphene and graphene-based nanostructures, including horizontal growth of monolayer and multilayer graphene sheets, vertical growth of graphene nanostructures (VG-GNs) such as graphene nanostripes (GNSPs) with large aspect ratios, direct and selective deposition of monolayer and multi-layer graphene on nanostructured substrates, and growth of multi-wall carbon nanotubes (MWCNTs). By properly controlling the gas environment of the plasma, it is found that no active heating is necessary for the PECVD growth processes, and that highyield growth can take place in a single step on a variety of surfaces, including metallic, semiconducting and insulating materials. Phenomenological understanding of the growth mechanisms are described. Finally, challenges and promising outlook for further development in the PECVD techniques for graphene-based applications are discussed.

show abstract

Trapped Photons Induced Ultrahigh External Quantum Efficiency and Photoresponsivity in Hybrid Graphene/Metal‐Organic Framework Broadband Wearable Photodetectors

Bera

Haider

Usman

et al. 2018

Adv Funct Materials

View full text Add to dashboard Cite

Metal‐organic frameworks (MOFs) have recently emerged as attractive materials for their tunable properties, which have been utilized for diverse applications including sensors, gas storage, and drug delivery. However, the high porosity and poor electrical conductivity of MOFs restrict their optoelectronic applications. Owing to the inherent tunability, a broadband photon absorbing MOF can be designed. Combining the superior properties of the MOFs along with ultrahigh carrier mobility of graphene, for the first time, this study reports a highly sensitive, broadband, and wearable photodetector on a polydimethylsiloxane substrate. The external quantum efficiency of the hybrid photodetector is found to be >5 × 108%, which exceeds all the reported values of similar devices. The porosity of the MOF and ripple structure graphene can assist the trapping of photons at the light‐harvesting layer. The device photoresponsivity is found to be >106 A W−1 with a response time of <150 ms, which is approximately ten times faster than the current standards of the graphene‐organic hybrid photodetectors. In addition, utilizing the excellent flexibility of the graphene layer the wearability of the devices with stretchability up to 100% is demonstrated. The unique discovery of MOF‐based high‐performance photodetectors opens up a new avenue in organic–inorganic hybrid optoelectronics.

show abstract

Stabilization of hybrid perovskite CH₃NH₃PbI₃thin films by graphene passivation

Abstract: Long-term passivation of water-sensitive hybrid perovskites with monolayer graphene.

Cited by 16 publications

References 60 publications

Scalable Graphene‐on‐Organometal Halide Perovskite Heterostructure Fabricated by Dry Transfer

Scalable Graphene‐on‐Organometal Halide Perovskite Heterostructure Fabricated by Dry Transfer

Single-step growth of graphene and graphene-based nanostructures by plasma-enhanced chemical vapor deposition

Trapped Photons Induced Ultrahigh External Quantum Efficiency and Photoresponsivity in Hybrid Graphene/Metal‐Organic Framework Broadband Wearable Photodetectors

Contact Info

Product

Resources

About