Solution‐Processable Reduced Graphene Oxide as a Novel Alternative to PEDOT:PSS Hole Transport Layers for Highly Efficient and Stable Polymer Solar Cells

Yun, Jin-Mun; Yeo, Jun-Seok; Kim, Juhwan; Jeong, Hyung-Gu; Kim, Dong‐Yu; Noh, Yong-Jin; Kim, Seok‐Soon; Ku, Bon‐Cheol; Na, Seok‐In

doi:10.1002/adma.201102207

Cited by 366 publications

(200 citation statements)

References 33 publications

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“…However, rGO-based solar cell devices retained 62% of initial value of PCE (9.95%) up to nearly 6 days, showing better environmental stability, as opposed to the complete failure of the PEDOT:PSS solar cell devices. Yun et al 118 used traditionally reduced GO and p-toluenesulfonyl hydrazide (pTosNHNH 2 )-reduced GO (pr-GO) thin lms as an anode interfacial layer in solar cells in place of a PEDOT:PSS layer to induce high PCE and stability in solar cells. The pr-GO-based solar cells showed an average PCE of 3.63%, which was comparable to PEDOT:PSS-based solar cells.…”

mentioning

confidence: 99%

Stability of graphene-based heterojunction solar cells

Singh

Nalwa

2015

RSC Adv.

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Bulk-heterojunction (BHJ) solar cells based on organic small molecules and polymers are the focus of increasing attention by science and commerce. In organic photovoltaic devices, a conjugated polymer layer is used as the donor, while a fullerene-based derivative is used as the acceptor. Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is one of the most common interfacial materials used for organic BHJ solar cells. However, PEDOT:PSS is acidic and hygroscopic in nature, and it inherits microstructural inhomogeneities that cause not only gradual degradation, but a complete failure of BHJ solar cell devices. There is a growing interest in graphene-based solar cells because graphene-based materials offer ease of solution processability, high optical transparency, and high power conversion efficiency. Graphene has been actively investigated for use as a transparent conducting electrode, and as a photoactive layer in fabricating solar cell devices. Power conversion efficiency in the range of 10% to 15% for graphene and inorganic semiconductor-based hybrid heterojunction solar cells, and 15.6% for graphene-containing perovskite solar cells has been observed.Organic materials-based solar cells degrade not only from environmental exposure, but also from photo-oxidation caused by light illumination. In addition to higher power conversion efficiency, stability in graphene-based solar cells is critically important for commercial applications. In this review article, the stability of graphene-based heterojunction solar cells under atmospheric conditions is evaluated. Current studies show that the insertion of a graphene buffer layer into solar cell heterostructures stops degradation and enhances stability in solar cell devices. Long-term environmental stability of graphenebased heterojunction solar cells for commercial applications is discussed.

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mentioning

confidence: 99%

Stability of graphene-based heterojunction solar cells

Singh

Nalwa

2015

RSC Adv.

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“…Nevertheless, slight enhancement of PCE was achieved as compared to reference device when HEL is incorporated. In fact, solution-based process of GO could not afford a smooth interface with active layer because large amount of functional groups remained on the GO surface [2]. Further optimization of reduction extent via the use of solution-processable should lead to additional development of the GO-based hole extraction layers in the device performance.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, fabrication of a suitable hole extraction layer (HEL) between the anode and the active layer as well as an electron extraction layer (EEL) between the cathode and the active layer is key technology for enhancement of the PSCs device performance and lifetime. Recently, solution-based processes graphene oxide (GO) has been considered as an efficient hole transport layer for high performance organic solar cells [1,2]. Although, GO has many advantages over organic-based HEL, one drawback of the GO is its insulating nature which leads to an increased series resistance with a concomitant decrease in fill factor (FF) and power conversion efficiency (PCE) of the resulting device [3].…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed rGO/AgNPs/rGO Sandwich Structure as a Hole Extraction Layer for Polymer Solar Cells

Tran

Thu

Tran

et al. 2015

Journal of Materials

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We found that inserting silver nanoparticles (AgNPs) between two layers of reduced grapheme oxide (rGO) has an effect on tailoring the work function of rGO. The utilization of rGO/AgNPs/rGO sandwich structure as the hole extraction layer in polymer solar cells is demonstrated. Solution-processable fabrication of this sandwich structure at the ITO/active layer interface facilitates the extraction of hole from active layer into ITO anode because of lowering the barrier level alignment at the interface. It results in an improvement of the short circuit current density and the overall photovoltaic performance.

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“…Typically, highly toxic and dangerous hydrazine is used for the reduction processes of GO layer to increase conductivity [17] and the development of effective and non-toxic alternative reduction process is necessary for the high quality GO.…”

Section: Introductionmentioning

confidence: 99%