Charge carrier photogeneration and hole transport properties of blends of a π-conjugated polymer and an organic-inorganic hybrid material

Han, Jung Wook; An, Jong Deok; Jana, R. N.; Jung, Kyung Na; Hwan, Jung; Pyo, S. M.; Im, Chang-Hwan

doi:10.1007/bf03218632

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…In the literatures, a series of carbazole-based molecules have been demonstrated as excellent hole transporting materials in past decades. [55][56][57] Therefore, it is believed that the 2PACz could ameliorate the hole transport in BHJ with the low-donor-content. Space charge-limited current (SCLC) measurements were implemented to investigate film hole (μ h ) and electron (μ e ) mobilities perpendicular to the substrate plane.…”

Section: Charge Generation Recombination and Extractionmentioning

confidence: 99%

Semitransparent Organic Solar Cells with Efficiency Surpassing 15%

Jing

Dong

Zhang

et al. 2022

Advanced Energy Materials

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counterparts and is very attractive for developing semitransparent organic solar cells (ST-OSCs), which have great potential application in building integrated photovoltaic, agricultural greenhouse, car window, and so on. [5,6] Different from opaque device that is concerned mostly with power conversion efficiency (PCE), ST-OSCs also value the transparency in the visible region and adopt average visible transmittance (AVT) to assess their see-through function. [7] However, there is a trade-off relationship between the see-through function and photovoltaic performances since enhancing the light transmission generally leads to lower amount of photons to be utilized. Therefore, efforts including material designing and device engineering are widely employed to reconcile the intrinsic contradiction between AVT and PCE. [8][9][10][11][12][13][14][15][16] Ideally, the photon-absorbing materials in ST-OSCs should have the main absorption in the NIR region and weak absorption in the visible region. [17] Previously, various narrow bandgap polymer donors were synthesized and matched with fullerene acceptors in ST-OSCs. [18,19] Recently, with the aid of advances in materials designing of NIR-absorbing non-fullerene electron acceptors, the PCEs of ST-OSCs have already surpassed 14%. [20,21] Meanwhile, optical engineering technologies, including photonic crystals, [22,23] antireflective device structures, [24,25] or optical microcavity structures, [26,27] have been applied to improve the PCEs and optimize the transmission spectra with deliberately designed layout but energy-consuming process. Other strategies, including multi-component, [28,29] sequentially deposited active layer [30,31] and thickness optimization [20] are also implemented to regulate photon harvesting range and improve PCEs in these fields.More directly, lowering the large-bandgap donor content in bulk-heterojunction (BHJ) has been demonstrated as a facile strategy to tune the transmittance spectrum of active layer. [32][33][34] The AVTs of D18-Cl:Y6-1O films have been continuously changed from 30.3% to 68.0% through ranging the donor and acceptor weight ratio (D:A ratio) from 1.1:1.6 to 0.1:1.6. [4] These previous works imply the feasibility of achieving high AVT from low-donor content ST-OSCs. Nevertheless, the performance optimization of OSCs with dilute donors still remains a challenge, mainly originating from the imbalanced charge Semitransparent organic solar cells (ST-OSCs) have promising prospects for building or vehicle integrated solar energy harvesting with energy generation and see-through function. How to achieve both an adequate average visible transmittance (AVT) and high-power conversion efficiency (PCE) is always the key issue. Herein, a simple but effective strategy for constructing high performance ST-OSCs by introducing a small molecule [2-(9-H-Carbazol-9-yl) ethyl] phosphonic acid (2PACz) into a low-donor content active layer is reported. The fill factor is improved from 70.5% to 75.5% and correlated to the mitigated charge recombination a...

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Section: Charge Generation Recombination and Extractionmentioning

confidence: 99%

Semitransparent Organic Solar Cells with Efficiency Surpassing 15%

Jing

Dong

Zhang

et al. 2022

Advanced Energy Materials

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“…37 Since the lowest unoccupied molecular orbital (LUMO) level of TPBi (2.7 eV) is situated between those of PVK (2.2 eV) and Ir(mppy) 3 (3.0 eV), the TPBi molecules diffused into the EML might have acted as the electron trap site. 39 In addition, Fig. 4b displays that the decrease in the current efficiency coincides with increasing NC.…”

Section: Resultsmentioning

confidence: 88%

Probing impact of interface mixing on the charge carrier dynamics of a solution-processed organic light emitting diode via impedance spectroscopy

2023

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“…It is frequently used as a polymeric host material in photovoltaic devices [3][4][5]. Recently, much work is being done on exploring the photoconductivity of PVK [6][7][8][9][10][11][12][13][14], yet a few have been reported that deal with the use of PVK as the polymeric host material where the polymer offers very poor efficiency [5,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic bulk heterojunction photovoltaic devices based on poly (9-vinylcarbazole)/gold nanocomposites: effect of aspect ratio of gold nanorod

Sharma

Bora

Gogoi

et al. 2015

J Mater Sci: Mater Electron

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A simple seeded growth method was employed to synthesize various aspect ratio gold (Au) nanorods and these nanorods were incorporated into a conducting polymer, poly (9-vinylcarbazole), PVK. A series of bulk heterojunction (BHJ) photovoltaic devices was fabricated using the nanocomposite materials as the active layer. A detailed investigation of device performance shows that the device parameters can be tuned by changing the aspect ratio of nanorods. A longer nanorod, provides larger scattering intensity, leading to a prolonged light transport path, thus increasing light absorption in the BHJ. Again, Au nanorods increase the shunt resistance and decrease the series resistance of the device that can lead to an increased value of open circuit voltage (V oc = 0.144-0.246 V). With increase in aspect ratio more percolation pathways form inside the active layer thus facilitating the transport of electrons and photocurrent as well. Present study shows that the photo conversion efficiency of a BHJ photovoltaic device was increased from 0.29 to 1.45 % with increasing the aspect ratio of Au nanorods from 2 to 3.5.

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Charge carrier photogeneration and hole transport properties of blends of a π-conjugated polymer and an organic-inorganic hybrid material

Cited by 9 publications

References 43 publications

Semitransparent Organic Solar Cells with Efficiency Surpassing 15%

Semitransparent Organic Solar Cells with Efficiency Surpassing 15%

Probing impact of interface mixing on the charge carrier dynamics of a solution-processed organic light emitting diode via impedance spectroscopy

Plasmonic bulk heterojunction photovoltaic devices based on poly (9-vinylcarbazole)/gold nanocomposites: effect of aspect ratio of gold nanorod

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