Impact of unbalanced charge transport on the efficiency of normal and inverted solar cells

Kotlarski, J. D.; Blom, Paul W. M.

doi:10.1063/1.3663860

Cited by 42 publications

(39 citation statements)

References 28 publications

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“…All observed systems with FF > 65% have a mobility ratio >0.1 meaning that the hole and electron mobilities are balanced within one order of magnitude. This trend agrees well with simulations and is expected to become even more pronounced as film thickness increases . Establishing balanced mobilities by itself however is not sufficient for achieving high FF as is clearly illustrated by the many data points with balanced mobilities but low FF .…”

supporting

confidence: 86%

Mobility Guidelines for High Fill Factor Solution‐Processed Small Molecule Solar Cells

2014

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supporting

confidence: 86%

Mobility Guidelines for High Fill Factor Solution‐Processed Small Molecule Solar Cells

2014

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“…The PCE vs µ h or µ e display mostly scattered plots; however, a strong positive correlation was deciphered for the PCE vs µ e /µ h ranging from 10 −3 to 10 -1 (Figure 6c). This highlights the superiority of mobility balance in the devices performance, in good accordance with the simulation reported by Blom et al 64 and experiments of our previous mono-adduct fullerenes. 47 On the other hand, we need to mention that the low-performing bis-adducts of SPCBM (PCE max = 1.59%), SCBA (PCE max = 1.62%), and CCBA (PCE max = 0.38%) are far below the general line.…”

Section: Methodssupporting

confidence: 92%

Hetero Bis-Addition of Spiro-Acetalized or Cyclohexanone Ring to 58π Fullerene Impacts Solubility and Mobility Balance in Polymer Solar Cells

Mikie

Saeki

Ikuma

et al. 2015

ACS Appl. Mater. Interfaces

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Fullerene bis-adducts are increasingly being studied to gain a high open circuit voltage (Voc) in bulk heterojunction organic photovoltaics (OPVs). We designed and synthesized homo and hetero bis-adduct [60]fullerenes by combining fused cyclohexanone or a five-membered spiro-acetalized unit (SAF5) with 1,2-dihydromethano (CH2), indene, or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). These new eight 56π fullerenes showed a rational rise of the lowest unoccupied molecular orbital (LUMO). We perform a systematic study on the electrochemical property, solubility, morphology, and space-charge-limited current (SCLC) mobility. The best power conversion efficiency (PCE) of 4.43% (average, 4.36%) with the Voc of 0.80 V was obtained for poly(3-hexylthiophene) (P3HT) blended with SAF5/indene hetero bis-adduct, which is a marked advancement in PCE compared to the 0.9% of SAF5 monoadduct. More importantly, we elucidate an important role of mobility balance between hole and electron that correlates with the device PCEs. Besides, an empirical equation to extrapolate the solubilities of hetero bis-adducts is proposed on the basis of those of counter monoadducts. Our work offers a guide to mitigate barriers for exploring a large number of hetero bis-adduct fullerenes for efficient OPVs.

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“…[164] In inverted device geometries, the two electrodes are essentially reversed, and electrons flow from the back electrode to the transparent electrode, which allows the use of as olution-processed back electrode. [164] In inverted device geometries, the two electrodes are essentially reversed, and electrons flow from the back electrode to the transparent electrode, which allows the use of as olution-processed back electrode.…”

Section: Invertedstructured Opvsmentioning

confidence: 99%

“…OPVs with an inverted structure have shown promise for higher lifetimes than those with an ormals tructure mainly because someo ft he mechanisms responsible for the degradation of OPVs do not exist if the cell structure is inverted. [164] In inverted device geometries, the two electrodes are essentially reversed, and electrons flow from the back electrode to the transparent electrode, which allows the use of as olution-processed back electrode. [94] Figure12s hows ac omparison between typical normal and inverted device structures.…”

Section: Invertedstructured Opvsmentioning

confidence: 99%

Methods for Improving the Lifetime Performance of Organic Photovoltaics with Low‐Costing Encapsulation

et al. 2015

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Recent years have seen considerable advances in organic photovoltaics (OPVs), most notably a significant increase in their efficiency, from around 4 % to over 10 %. The stability of these devices, however, continues to remain an issue that needs to be resolved to enable their commercialization. This review discusses the main degradation processes of OPVs and recent methods that help to increase device stability and lifetime. One of the most effective steps that can be taken to increase the lifetime of OPVs is their encapsulation, which protects them from atmospheric degradation. Efficient encapsulation is essential for long-term device performance, but it is equally important for the commercialization of OPVs to strike a balance between achieving the maximum device protection possible and using low-cost processing for their encapsulation. Various encapsulation techniques are discussed herein, with emphasis on their cost effectiveness and their overall suitability for commercial applications.

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Impact of unbalanced charge transport on the efficiency of normal and inverted solar cells

Cited by 42 publications

References 28 publications

Mobility Guidelines for High Fill Factor Solution‐Processed Small Molecule Solar Cells

Mobility Guidelines for High Fill Factor Solution‐Processed Small Molecule Solar Cells

Hetero Bis-Addition of Spiro-Acetalized or Cyclohexanone Ring to 58π Fullerene Impacts Solubility and Mobility Balance in Polymer Solar Cells

Methods for Improving the Lifetime Performance of Organic Photovoltaics with Low‐Costing Encapsulation

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