Chemically Converted Graphene as a Hole Transport Layer (HTL) Inorganic Photovoltaics (OPVS)

Haque, Farjana; Rahman, Md. Moshiur; Mahmud, Md. Abdullah Al; Reza, M. Subbir; Akter, Munmun; Karim, A.H.M. Zadidul

doi:10.18034/ei.v6i1.1085

Cited by 2 publications

(3 citation statements)

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“…This is of crucial importance in optical applications [1,4,15,20]. In organic solar cells, interlayers locating between active layers and electrodes play an important role in achieving high overall efficiency as well as device stability [4,6,9,12,19]. Functioning as intermediate buffering layers, they help to reduce the potential difference between active layers and electrodes so that electrons and holes can be effectively separated to both sides and carrier collection at the electrodes can be intensified.…”

Section: Resultsmentioning

confidence: 99%

“…Up to this time, different scenarios have been proposed to boost cell efficiency [8][9][10]. Among them, one commonly accepted method is to integrate organic solar cells with inor-ganic nanostructured materials (CdSe, CdS, and PbSe) to constitute hole/electron transport, hole/electron extract, or hole/electron blocking layers [11].…”

Section: Introductionmentioning

confidence: 99%

“…Such layers play a significant role in creating intermediate energy levels, well-fitting for Ec, Ev levels of active layers in optoelectronic devices, to reduce potential barrier difference between active layers and electrodes or between active layers themselves. This arrangement will help to raise the possibility of carrier collection at the electrodes and, therefore, increase the cell efficiency [1,2,4,9,12,13]. However, by virtue of high toxicity in their nature, CdSe and CdS have gradually been substituted by environment-green materials [6,14].…”

Section: Introductionmentioning

confidence: 99%

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A Facile Microwave-Assisted Hydrothermal Synthesis of Graphene Quantum Dots for Organic Solar Cell Efficiency Improvement

Hoang

Pham

Tran

2020

Journal of Nanomaterials

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Carbon-based nanomaterials have successively remained at the forefront of different research fields and applications for years. Understanding of low-dimension carbon material family (CNT, fullerenes, graphene, and graphene quantum dots) has arrived at a certain extension. In this report, graphene quantum dots were synthesized from graphene oxide with a microwave-assisted hydrothermal method. Compared with conventional time-consuming hydrothermal routes, this novel method requires a much shorter time, around ten minutes. Successful formation of quantum dots derived from graphene sheets was verified with microscopic and spectroscopic characterization. Nanoparticles present a diameter of about 2-8 nm, blue emission under ultraviolet excitation, and good dispersion in polar solvents and can be collected in powder form. The synthesized graphene quantum dots were utilized as a hole transport layer in organic solar cells to enhance the cell quantum efficiency. Such quantum dots possess energy levels (Ec and Ev) relevant to HOMO and LUMO levels of conductive polymers. Mixing P3HT:PCBM polymer and graphene quantum dots of sufficient extent notably helps reduce potential difference at interfaces of the two materials. Overall efficiency consequently advances to 1.43%, an increase of more than 44% compared with pristine cells (0.99%).

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