Transient photovoltaic behavior of air-stable, inverted organic solar cells with solution-processed electron transport layer

Kim, Chang-Su; Lee, Stephanie S.; Gomez, Enrique D.; Kim, Jong-Bok; Loo, Yueh Lin

doi:10.1063/1.3099947

Cited by 148 publications

(129 citation statements)

References 21 publications

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“…The photocurrent continuously increases with an increase in the irradiation time and this corresponds to a decrease in both R1 and R2. Kim et al 26 reported that the emergence of photoconduction of titanium oxide films mirrored the increase and gradual saturation of the photocurrent of TiO x cells. This may be supported by the decrease in R1.…”

Section: -1 Characteristics Of the Inverted Polymer Solar Cells Upomentioning

confidence: 99%

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Kawamata¹,

Yano²,

Yamaguchi³

et al. 2015

J. Phys. Chem. C

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In the glass-indium tin oxide (ITO) / titanium oxide (TiO x ) / regioregular poly(3-hexylthiophene) (P3HT) : [6,6]-phenyl C 61 butyric acid methyl ester (PCBM) / poly(3,4-ethylenedioxylenethiophene) : poly(4-styrene sulfonic acid) (PEDOT:PSS) / Au cell (TiO x cell), which contains amorphous titanium oxide prepared by chemical bath deposition and dried at 150 °C, a light soaking effect has been observed upon irradiation with white light.In contrast, in ITO / titanium oxide (TiO 2 ) / P3HT:PCBM / PEDOT:PSS / Au cell (TiO 2 cell), which contains anatase titanium oxide prepared by heat treatment at 450 °C, the maximum power conversion efficiency was obtained just after irradiation with white light. The number of P3HT + cation radicals in the quartz-ITO/TiO x and TiO 2 /P3HT:PCBM substrates was estimated by ESR measurements at room temperature upon irradiation with white light. They increased gradually with an increase in irradiation time for the TiO x substrate, but increased only slightly just after light irradiation for the TiO 2 substrate. Upon irradiation with UV-cut light, the performance of the TiO x cell was inferior to that of the TiO 2 cell. This could be related to the resistances of the P3HT:PCBM layers which were estimated by alternating-current impedance spectroscopy. The resistance of the P3HT:PCBM layer in the TiO x cell was much larger than that in the TiO 2 cell, though the difference between the two cells was merely heat treatment temperature of titanium oxide films using as electron collection layers. That is, the concentration of photocarriers in the P3HT:PCBM of the TiO x 2 cell was significantly less than that in the P3HT:PCBM of the TiO 2 cell. From these experimental results, the light soaking effect could be reasonably explained by assuming the existence of charge recombination centers in the TiO x near the TiO x /P3HT:PCBM interface.

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Section: -1 Characteristics Of the Inverted Polymer Solar Cells Upomentioning

confidence: 99%

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Kawamata¹,

Yano²,

Yamaguchi³

et al. 2015

J. Phys. Chem. C

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“…Both of these are detrimental to the device lifetime of BHJ PSCs. [8][9][10] The rapid advancement in the PCE of PSCs, means that the poor stability of PSCs is becoming one of the crucial obstacles to commercialization. One approach to solve this issue is using an inverted structure in which the charge separation and collection nature of the electrode are reversed.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of TiO_Xfilm as an interface material for efficient inverted polymer solar cells

et al. 2014

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Titanium oxide (TiO X ) is an effective electron transport layer in polymer solar cells (PSCs). Here, we report an efficient inverted polymer solar cell based on P3HT and fullerenes using a high density, single-step solution processed amorphous TiO X (a-TiO X ) film as an electron transport layer. The a-TiO X film was prepared by spin coating tetrabutyl titanate (TBT) isopropanol solution onto ITO coated glass in a glovebox filled with ). In addition, the PSCs with the a-TiO X electron transport layer exhibited good stability. The results indicate that facile preparation of a-TiO X films using cheap TBT is promising for high-efficiency PSCs and large-scale fabrication of flexible electronics.

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“…Mostly the open-circuit voltage (V oc ) or the fill factor (FF) are negatively affected. The low FF often comes along with distorted current-voltage (J-V ) curves in the extreme case showing inflection points close to V oc (so-called S-kink) [6,7,8,9].…”

mentioning

confidence: 99%

Simple experimental test to distinguish extraction and injection barriers at the electrodes of (organic) solar cells with S-shaped current–voltage characteristics

Tress

Inganäs

2013

Solar Energy Materials and Solar Cells

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Adjusting the work function of the two electrodes to the energy levels of the intrinsic active materials of an organic solar cell is crucial for a good device performance. Often, injection barriers (in combination with selective contacts blocking one charge carrier species) caused by a misaligned metal work function or extraction barriers resulting from insulating intentional or unintentional interlayers between metal and active layers, result in a decrease in fill factor seen in the extreme case in S-shaped current–voltage (J–V) characteristics. To avoid this S-kink, it is essential to identify its origin, desirably applying a simple experimental method. We propose an approach based on analyses of current–voltage data as a function of illumination intensity. A normalization of the J–V curves at the saturated photocurrent reveals distinctive features for each type of barrier. We apply the method to planar heterojunction small-molecule and bulk heterojunction polymer solar cells with oxidized metal electrode or plasma-treated active layer and explain the theory with a drift-diffusion model.

Funding Agencies|BMBF (OPEG)|13N9720|Reiner Lemoine foundation||Science Council (V)||Swedish Energy Agency||Knut and Alice Wallenberg Foundation||

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Transient photovoltaic behavior of air-stable, inverted organic solar cells with solution-processed electron transport layer

Cited by 148 publications

References 21 publications

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Facile preparation of TiO_Xfilm as an interface material for efficient inverted polymer solar cells

Simple experimental test to distinguish extraction and injection barriers at the electrodes of (organic) solar cells with S-shaped current–voltage characteristics

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Transient photovoltaic behavior of air-stable, inverted organic solar cells with solution-processed electron transport layer

Cited by 148 publications

References 21 publications

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Mechanistic Investigation into the Light Soaking Effect Observed in Inverted Polymer Solar Cells Containing Chemical Bath Deposited Titanium Oxide

Facile preparation of TiOXfilm as an interface material for efficient inverted polymer solar cells

Simple experimental test to distinguish extraction and injection barriers at the electrodes of (organic) solar cells with S-shaped current–voltage characteristics

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Facile preparation of TiO_Xfilm as an interface material for efficient inverted polymer solar cells