Influence of electric field distortion and i-layer quality on the collection function of drift-driven a-Si:H solar cells

Hof, C.; Wyrsch, Nicolas; Shah, A.

doi:10.1016/s0022-3093(99)00913-8

Cited by 9 publications

(5 citation statements)

References 6 publications

(10 reference statements)

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“…The charge transport in organic BHJ cells and conventional pin cells relies on the same device architecture, namely a built‐in electric field along the absorber, which facilitates the extraction of low mobility carriers. Since several analytical models have been proposed to describe the JV characteristics of inorganic pin type diodes and solar cells 55–59, it is reasonable to apply them to BHJ cells taking into account the particularities of the organic semiconductors. Next, we adapt two of these models to BHJ cells with exponential density of states in the mobility gap.…”

Section: Short Circuit Current Vs Thickness Dependencementioning

confidence: 99%

Comparison of device models for organic solar cells: Band‐to‐band vs. tail states recombination

Soldera

Taretto

Kirchartz

2011

Physica Status Solidi (a)

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The efficiency-limiting recombination mechanism in bulkheterojunction (BHJ) solar cells is a current topic of investigation and debate in organic photovoltaics. In this work, we simulate state-of-the-art BHJ solar cells using two different models. The first model takes into account band-to-band recombination and field dependent carrier generation. The second model assumes a Shockley-Read-Hall (SRH) recombination mechanism via tail states and field independent carrier generation. Additionally, we include in both cases optical modelling and, thus, position-dependent exciton generation and non-ideal exciton collection. We explore both recombination mechanisms by fitting light and dark current-voltage (JV) characteristics of BHJ cells of five materials: P3HT, MDMO-PPV, MEH-PPV, PCDTBT and PF10TBT, all blended with fullerene derivatives. We show that although main device parameters such as short circuit current, open circuit voltage, fill factor and ideality factor are accurately reproduced by both Langevin and tail recombination, only tail recombination reproduces also the ideality factor of dark characteristics accurately. Nevertheless, the model with SRH recombination via tail states needs the inclusion of external circuitry to account for the heavy shunt present in all the blends, except P3HT:PCBM, when illuminated. Finally, we propose a means to find analytical expressions for the short circuit current by assuming a linear relation between the recombination rate and the concentration of free minority carriers. The model reproduces experimental data of P3HT cells at various thickness values using realistic parameters for this material. Dark JV measurement (circles) of a PCDTBT:PC 70 BM solar cell (Park et al., Nature Photon. 3, 297 (2009) [1]), the fit with the model including recombination via tail states (solid line) and the fit with the model reported by Koster et al. (Phys. Rev. B 72, 085205 (2005) [2], dashed line) that includes bimolecular band-to-band recombination and charge transfer state (CTS) dissociation. The inset shows the JV curves under white light.

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Section: Short Circuit Current Vs Thickness Dependencementioning

confidence: 99%

Comparison of device models for organic solar cells: Band‐to‐band vs. tail states recombination

Soldera

Taretto

Kirchartz

2011

Physica Status Solidi (a)

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“…Microscopic structure and solar cell performance in hydrogenated mixed-phase thin film silicon solar cells were studied by AFM and c-AFM [18]. The coplanar transport property in nc-Si:H related to the size of nanocrystal conglomerates was also revealed by A. Shah group through AFM observations [19]. M. Teska has studied AFM and STM investigations of topography and barrier heights of hydrogenated amorphous silicon [20].…”

Section: Characterizationsmentioning

confidence: 99%

Thin Film Solar Cell: Characteristics and Characterizations

Hossain

2015

AMR

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In recent decades, due to some urgent and unavoidable issues, such as increasing energy demand, climate change, global warming, etc., the R&D of renewable energies have become inevitable to pave way the sustainable development of human society. In this regard, solar power is widely considered as the most appealing clean energy since there is no other one being as abundant as the sun. The amount of solar energy reaching our earth within one hour equals to the total annual energy need of all of humankind. Since the energy resources on Earth are being exhausted, solar energy have to serve as the main energy source in coming century and beyond. The photovoltaic solar cells developed so far have been based on silicon wafers, with this dominance likely to continue well into the future. The surge in manufacturing volume as well as emerging technologies over the last decade has resulted in greatly decreased costs. Therefore, several companies are now well below the USD 1 W−1 module manufacturing cost benchmark that was once regarded as the lowest possible with this technology. Thin-film silicon, such as hydrogenated amorphous silicon (a-Si), microcrystalline silicon (mc-Si) and related alloys, are promising materials for very low-cost solar cells. Here in this article, a brief description of thin film solar cell technologies followed by deferent state-of-art tools used for characterizing such solar cells are explored. Since characteristics of thin-film solar cells are the main ingredient in defining efficiency, the inherent properties are also mentioned alongside the characterizations.

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“…In equation (1), J is the current density, V is the applied voltage, J 0 is the reverse saturation current density, q is the elementary charge, n is the diode ideality factor, k B is the Boltzmann constant, T is the absolute temperature, R S is the series resistance, R Sh is the shunt resistance, J ph is the photogenerated current density, and J rec represents an additional loss term of J ph in the active layer, which increases significantly with the forward voltage. The J rec has been considered in the solar cells which consist of disordered materials, such as amorphous silicon solar cells [20,24,25] or organic solar cells [23]. Without light illumination (J ph and J rec =0), the diode characteristics including J 0 , n, R S , and R Sh can be estimated (evaluated parameters are summarized in table 2).…”

Section: Solar Cell Performances With Surface Modified Cdse Qdsmentioning

confidence: 99%

“…We carried out incident light intensity dependent J-V measurements of the devices and analyzed the collection voltage (V C ) [20,23,25] and J SC [30,31] to further investigate carrier recombination and the collection characteristics of solar cells with different ligand exchange/elimination procedures.…”

Section: Light Intensity Dependent Solar Cell Characteristicsmentioning

confidence: 99%

“…In the case of solar cells with disordered materials, the linear fits of the J-V curves of various incident light intensities in short circuit conditions (V=0), intersect the x-axis at a single point of voltage, which is called V C (figure 4) [20,[23][24][25]. This phenomenon is related to the J rec in equation (1) since J rec is dependent on the illumination intensity.…”

Section: Light Intensity Dependent Solar Cell Characteristicsmentioning

confidence: 99%

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The influence of sequential ligand exchange and elimination on the performance of P3HT:CdSe quantum dot hybrid solar cells

et al. 2015

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We report on a sequential ligand exchange and elimination process for the fast and easy surface modification of CdSe quantum dots (QDs) in order to improve the electronic interaction between poly(3-hexylthiophene) (P3HT) and CdSe QDs in P3HT:CdSe hybrid solar cells. We systematically investigated the influence of surface treatment on the insulating ligand shell of CdSe QDs using (1)H-NMR analysis, and correlated their influence on the photovoltaic properties of P3HT:CdSe hybrid solar cells. A decrease in the average thickness of the ligand shells directly improved carrier transport properties. Moreover, the presence of remnant 1-hexylamine ligands provided efficient surface trap passivation. As a result, overall solar cell performance (especially fill factor and power conversion efficiency) was enhanced and the recombination mechanism was dominated by monomolecular recombination due to enhanced carrier collection length (l(C0)).

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Influence of electric field distortion and i-layer quality on the collection function of drift-driven a-Si:H solar cells

Cited by 9 publications

References 6 publications

Comparison of device models for organic solar cells: Band‐to‐band vs. tail states recombination

Comparison of device models for organic solar cells: Band‐to‐band vs. tail states recombination

Thin Film Solar Cell: Characteristics and Characterizations

The influence of sequential ligand exchange and elimination on the performance of P3HT:CdSe quantum dot hybrid solar cells

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