Application of Inorganic/Organic Stacked Hole Transporting Layer in Organic Solar Cells

Su, Shui‐Hsiang; Lin, Wen-Kai; Chiang, Wang-Ta; Lin, Yanfu; Yokoyama, M.

doi:10.7567/jjap.51.02bk03

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…57 In the same way it was described before for the inverted OSC in Section 3.2. OSCs applying V 2 O 5 as the HTL 5,10,13,14,[16][17][18][19][20][81][82][83] have been usually reported with an Ag metal electrode in the inverted conguration, 5,10,15,57 and an Al or Ca electrode in the normal conguration. 14,19,21,58 In our work, the photovoltaic response of both types of OSCs seems to be independent of the Ag back metal electrode employed.…”

Section: Papermentioning

confidence: 99%

“…Their most attractive feature is the possibility to be deposited by low temperature solution processing methods. Among them are also V 2 O 5 , [12][13][14][15][16][17][18][19][20][21] NiO, [22][23][24][25][26][27][28][29][30] MoO 3 , [31][32][33][34][35] WO 3 [36][37][38][39] or Sb 2 O 3 . 40 These TMOs exhibit a wide range of energy level alignments, [41][42][43][44] good transparency as thin lms, are easy to manipulate, and confer low-resistance ohmic contacts to the OSC.…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature, solution-processed, layered V2O5 hydrate as the hole-transport layer for stable organic solar cells

Terán-Escobar

Pampel

Caicedo

et al. 2013

Energy Environ. Sci.

178

134

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Layered V 2 O 5 hydrate has been applied as the hole transport layer (HTL) in organic solar cells (OSCs). V 2 O 5 is obtained from a sodium metavanadate solution in water under ambient conditions, resulting in a final thin film of formula V 2 O 5 $0.5H 2 O. The 0.5 water molecules are not removed from the V 2 O 5 layered structure unless the sample is heated above 250 C, which makes the thin film highly stable under real working conditions. The HTL was used in OSCs in the normal and the inverted configurations, applying metallic Ag as the back-metal electrode in both cases. Fabrication of both OSC configurations completely by solution-processing printing methods in air is possible, since the Al electrode needed for the normalconfiguration OSC is not required. The work function (WF) and band gap energy (BG) of the V 2 O 5 thin films were assessed by XPS, UPS and optical analyses. Different WF values were observed for V 2 O 5 prepared from a fresh V 2 O 5-isopropanol (IPA) solution (5.15 eV) and that prepared from a 24 hold solution (5.5 eV). This difference is due to the gradual reduction of vanadium (from V 5+ to V 4+) in IPA. The OSCs made with the V 2 O 5 thin film obtained from the 24 hold V 2 O 5-IPA solution required photoactivation, whereas those made with the freshly obtained V 2 O 5 did not. Outdoor stability analyses of sealed OSCs containing a V 2 O 5 HTL in either configuration revealed high stability for both devices: the photovoltaic response at T 80 was retained for more than 1000 h. Broader context Organic Solar Cells (OSCs) have achieved an impressive increase in power conversion efficiency in the past few years, with values above the 12% range. Yet, in order to be competitive with existing energy sources from fossil fuels and modern inorganic photovoltaic technologies, OSCs must reduce fabrication costs and improve its energy payback time (EPBT). To achieve the latter, the fabrication of OSCs by large scale, solution processing methods applying inexpensive, low temperature techniques is required. An important aim is the exclusion of toxic organic solvents, being water-based or alcohol-based solutions is highly desired. In this work, a layered V 2 O 5 hydrate has been applied as the hole transport layer in stable OSCs. V 2 O 5 is obtained from the dissolution of sodium metavanadate in water under ambient atmospheric conditions, resulting in a nal thin lm with the V 2 O 5 $0.5H 2 O formula. OSCs with normal and inverted conguration applying metallic Ag as the back metal electrode in both cases have been fabricated. The use of a Ag electrode eliminates the need for a highly reactive work function metal electrodes (Al, Ca) for the normal conguration OSC, and permits the fabrication of both OSC congurations completely by solution processing printing methods in air. Outdoor stability analyses of sealed devices showed high stability, maintaining the photovoltaic response at T 80 for more than 1000 h.

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Section: Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-temperature, solution-processed, layered V2O5 hydrate as the hole-transport layer for stable organic solar cells

Terán-Escobar

Pampel

Caicedo

et al. 2013

Energy Environ. Sci.

178

134

View full text Add to dashboard Cite

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“…However, since the V 2 O 5 film produced by the solution-process is not continuous, its coating ability is so poor that it is harmful to the deposition of the active layer. To this, a double-decked layer of PEDOT: PSS/V 2 O 5 has been produced and widely employed in recent years. − Pan et al developed the P3HT:PCBM-based OSC with PEDOT:PSS/V 2 O 5 as HTL, whose PCE is 3.56% . The studies show that the PEDOT: PSS can fulfill the voids of the V 2 O 5 film, thus providing a smother surface for subsequent film growth. , Meanwhile, the V 2 O 5 also overcomes the problem of the poor stability caused by the acerbic and hygroscopic properties of PEDOT:PSS.…”

Section: Inorganic Materialsmentioning

confidence: 99%

Materials for Interfaces in Organic Solar Cells and Photodetectors

Chen

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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Interface engineering is very important to the high performance of organic optoelectronic devices that are commonly composed of multilayer thin solid films. Interfacial materials are particularly crucial for interface engineering, and a variety of materials have been employed at the interface to accomplish various different functions. This Review summarizes various materials for the interfaces and some of the latest progress in organic solar cells (OSCs) and organic photodetectors (OPDs).

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