In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

Feng, Xiao; Wang, Yuheng; Tong, Xiao; Shen, Zichao; Ren, Yurong; Lu, Guanghao; Bu, Laju

doi:10.3389/fchem.2020.00211

Cited by 13 publications

(7 citation statements)

References 54 publications

(45 reference statements)

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“…of the active layer thickness and architecture of organic solar cells has been observed [40][41][42]. Taking into account that the studied organic solar half-cells were standard architecture devices (without a top electrode, ITO/PEDOT:PSS/active layer), the absorption distribution of light wavelength across the sample could be similar or even the same as that reported in the article by [40].…”

Section: Photoactive Kelvin Probe Force Microscopy (P-kpfm)supporting

confidence: 60%

Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications

et al. 2023

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In this work, macro- and nanodiagnostic procedures for working, third-generation photovoltaic devices based on a modified polymer:fullerene (P3HT:PCBM) absorber were conducted using atomic force microscopy (AFM) and impedance spectroscopy (IS) equipment. All experiments were performed both in the dark and under irradiation with a specific light wavelength. Photoactive Kelvin probe force microscopy (p-KPFM) and impedance spectroscopy (p-IS) experiments were conducted on half- and whole-solar cell devices. Based on the p-KPFM measurements, the surface potential (SP) and surface photovoltage (SPV) on top of the active layer at the micro/nanoscale were estimated for various light wavelengths (red, green, blue, and white). For light in the red spectrum range, which was associated with an optical absorption edge and acceptor states that occurred in the band gap of the P3HT material after doping the donor polymer with iodine, the SPV was measured at levels of 183 mV, 199 mV, and 187 mV for the samples with 0%, 5% and 10% iodine doping, respectively. In addition, a macroscale investigation enabling the determination of the electrical parameters of the studied organic solar cells (OSCs) was carried out using p-IS. Based on the data obtained during p-IS experiments, it was possible to propose a series electrical equivalent circuit to define and describe the charge transfer phenomenon in the OSCs. Estimations of data obtained from the fitting of the experimental results of p-IS under white light allowed us to evaluate the average diffusion time of electric charges at 8.15 µs, 16.66 µs, and 24.15 µs as a function of organic layer thickness for the device without doping and with 5% and 10% iodine doping. In this study, we demonstrated that correlating information obtained at the macro- and nanoscale enabled a better understanding of the electrical charge distribution of OSCs for indoor applications.

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Section: Photoactive Kelvin Probe Force Microscopy (P-kpfm)supporting

confidence: 60%

Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications

et al. 2023

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“…Based on the absorption spectra of the mixture of DPP-DTT and N2200 (Fig. 2b), the absorption peak at 800 nm was chosen as the characteristic peak of DPP-DTT and the absorption peak at 400 nm was chosen as the characteristic peak of N2200 to calculate the component distribution of DPP-DTT:N2200 films, 81,82 where the difference in peak position and intensity between the two absorption peaks was obvious, resulting in a smaller calculation error and more accurate calculation results. After that, we tested the surface roughness of the DPP-DTT:N2200 blend film by atomic force microscope (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-performance asymmetric electrode structured light-stimulated synaptic transistor for artificial neural networks

Ran,

Lu,

Wang

et al. 2023

Mater. Horiz.

Self Cite

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“…Moreover, to check the degree of interpenetration and mixing between the donor and acceptor, the vertical distributions of D18 and PY-IT in three types of blend films were quantitatively investigated by film-depth-dependent light absorption spectrometry (FLAS), as shown in Figure 5a-c. [35,36] Utilizing D18 and PY-IT neat films to fit the light absorption profiles of each subfilm, a composition distribution along film depth direction was extracted. The results displayed that D18 accumulated near the anode, PY-IT accumulated near the cathode, and effective swelling and interpenetration occurred between the polymer donor and acceptor.…”

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Layer‐by‐Layer All‐Polymer Solar Cell Enabled by Bottom‐Layer Optimization

Dou,

Hong,

Jing

et al. 2023

Solar RRL

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All‐polymer solar cells (all‐PSCs) have attracted extensive attention for their advantages in long‐term thermal‐ and photostability. However, the power conversion efficiencies (PCEs) of all‐PSCs still lag behind organic solar cells based on small‐molecular acceptors. The long‐chain entanglement between polymers brings complex morphological problems, which contribute to lower fill factor (FF). Herein, an effective approach is proposed to build the ideal morphology and pseudo‐p–i–n vertical component distribution in all‐polymer active layer by independently casting donor and acceptor films with different solvents. Through the solvent engineering, the layer‐by‐layer device with o‐xylene and carbon disulfide (O‐XY:CS2)‐processed D18 donor layer achieves a PCE of 17.53%, much higher than commonly used solvents (chloroform and chlorobenzene) processed donor layers with PCEs of 16.49 and 16.04%, respectively. In‐depth investigation reveals that outstanding performance of O‐XY:CS2‐processed donor layer device is attributed to mitigated bimolecular recombination, more balanced mobility, and reduced trap density of states, which contribute to the enhancement of short‐current density and FF. Moreover, favorable morphology network also brings prolonged lifetime under continuous light soaking. This work presents a simple and effective way to obtain ideal active layer morphology and construct favorable vertical component distribution through optimizing donor morphology in all‐PSCs.

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In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

Cited by 13 publications

References 54 publications

Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications

Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications

High-performance asymmetric electrode structured light-stimulated synaptic transistor for artificial neural networks

High‐Efficiency Layer‐by‐Layer All‐Polymer Solar Cell Enabled by Bottom‐Layer Optimization

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