Effects of idling time between depositions of organic layers and metal electrode in organic photovoltaic device

Chandran, Hrisheekesh Thachoth; Qing, Jian; Zhang, Hongyou; Chan, Chui-Yee; Ng, Tsz‐Wai; Lo, Ming‐Fai; Lee, Chun‐Sing

doi:10.1016/j.orgel.2015.07.030

Cited by 5 publications

(4 citation statements)

References 28 publications

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Section: Subphthalocyaninesmentioning

confidence: 99%

“…Interestingly, as a result of the build-in field induced by the MoO x /20 Schottky junction, the PCE was increased by 35.4% compared with the reference cell without SubPc (from PCE of 2.77% to 3.75%). 378 Conventional heterojunction OSCs typically involve the deposition of the electron donor layer on top of a transparent anode, with the cathode deposited last. However, inverting the configuration (i.e., acceptor deposited on the transparent electrode) offers several advantages.…”

Section: Planar-heterojunction (Phj) Solar Cells This Type Of Heteroj...mentioning

confidence: 99%

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Recent advances in subphthalocyanines and related subporphyrinoids

et al. 2022

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Section: Subphthalocyaninesmentioning

confidence: 99%

Section: Planar-heterojunction (Phj) Solar Cells This Type Of Heteroj...mentioning

confidence: 99%

Recent advances in subphthalocyanines and related subporphyrinoids

et al. 2022

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“… 19 The optimum thickness of this layer may depend on its nature, and it may be thinner 20 or thicker; 21 but overall, the studies converge toward an optimum thickness of the order of 8–10 nm. 13 − 17 , 21 − 23 This is the reason we chose a thickness of 9 nm in our study. Alq 3 was chosen as the EBL due to the fact that it significantly increases the lifetime of the OPVs.…”

Section: Introductionmentioning

confidence: 99%

“…17 Moreover, it is well known that interface dipoles are often present at organic/metal interfaces, 18 and it was shown that surface dipoles can be formed and can lower the work function of electrodes upon EBL deposition, which allows for the reduction of the ITO work function and permits better carrier collection. 19 The optimum thickness of this layer may depend on its nature, and it may be thinner 20 or thicker; 21 but overall, the studies converge toward an optimum thickness of the order of 8−10 nm. 13−17,21−23 This is the reason we chose a thickness of 9 nm in our study.…”

Section: Introductionmentioning

confidence: 99%

Power Conversion Efficiency Improvement of Planar Organic Photovoltaic Cells Using an Original Hybrid Electron-Transporting Layer

et al. 2021

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In organic photovoltaic (OPV) cells, besides the organic active layer, the electron-transporting layer (ETL) has a primordial role in transporting electrons and blocking holes. In planar heterojunction-OPVs (PHJ-OPVs), the ETL is called the exciton blocking layer (EBL). The optimum thickness of the EBL is 9 nm. However, in the case of inverted OPVs, such thickness is too high to permit efficient electron collection, due to the fact that there is no possibility of metal diffusion in the EBL during the top metal electrode deposition. In the present work, we show that the introduction of a thin potassium layer between the indium tin oxide (ITO) cathode and the EBL increases dramatically the conductivity of the EBL. We demonstrate that K not only behaves as a simple ultrathin layer allowing for the discrimination of the charge carriers at the cathode/organic material interface but also by diffusing into the EBL, it increases its conductivity by 3 orders of magnitude, which allows us to improve the shape of the J – V characteristics and the PHJ-inverted OPV efficiency by more than 33%. Moreover, we also show that PHJ-inverted OPVs with K in their EBLs are more stable than those with Alq 3 alone.

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Direct Free Carrier Photogeneration in Single Layer and Stacked Organic Photovoltaic Devices

Chandran

Foo

et al. 2017

Advanced Materials

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High performance organic photovoltaic devices typically rely on type-II P/N junctions for assisting exciton dissociation. Heremans and co-workers recently reported a high efficiency device with a third organic layer which is spatially separated from the active P/N junction; but still contributes to the carrier generation by passing its energy to the P/N junction via a long-range exciton energy transfer mechanism. In this study the authors show that there is an additional mechanism contributing to the high efficiency. Some bipolar materials (e.g., subnaphthalocyanine chloride (SubNc) and subphthalocyanine chloride (SubPc)) are observed to generate free carriers much more effectively than typical organic semiconductors upon photoexcitation. Single-layer devices with SubNc or SubPc sandwiched between two electrodes can give power conversion efficiencies 30 times higher than those of reported single-layer devices. In addition, internal quantum efficiencies (IQEs) of bilayer devices with opposite stacking sequences (i.e., SubNc/SubPc vs SubPc/SubNc) are found to be the sum of IQEs of single layer devices. These results confirm that SubNc and SubPc can directly generate free carriers upon photoexcitation without assistance from a P/N junction. These allow them to be stacked onto each other with reversible sequence or simply stacking onto another P/N junction and contribute to the photocarrier generation.

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Effects of idling time between depositions of organic layers and metal electrode in organic photovoltaic device

Cited by 5 publications

References 28 publications

Recent advances in subphthalocyanines and related subporphyrinoids

Recent advances in subphthalocyanines and related subporphyrinoids

Power Conversion Efficiency Improvement of Planar Organic Photovoltaic Cells Using an Original Hybrid Electron-Transporting Layer

Direct Free Carrier Photogeneration in Single Layer and Stacked Organic Photovoltaic Devices

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