High-bandwidth, high-sampling-rate, low-noise, two-probe transient photovoltage measuring system

Chen, Xiaoqing; Wu, Bo

doi:10.1063/1.4905576

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The competition between the charge separation/collection processes and the recombination loss processes of the photogenerated electron–hole pairs determines the photoelectric conversion efficiency of PVDs . To further understand the ipsilateral separation mechanism taking place at the TiO 2 /SLG/dye ternary interface, the charge-transfer dynamic processes of the TiO 2 /SLG/AO device were studied by transient photoluminescence (PL) and transient photovoltage methods . Before studying the intrinsic lifetimes (τ) of the dye’s excited states, AO molecules were dispersed in the PMMA matrix and measured by a PL method.…”

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confidence: 99%

“…The transient photovoltage rise has a quantitative relationship with the dynamic processes of charge transport in PVDs . The photovoltage generation processes occurring in the TiO 2 /SLG/AO device were equivalent to the charging processes of the In–Ag/TiO 2 /SLG parallel-plate capacitor in which the In/Ag back metal layer and the graphene layer are regarded as the two electrodes of the capacitor sandwiching an intermediate TiO 2 dielectric layer.…”

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confidence: 99%

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High-Efficiency Selective Electron Tunnelling in a Heterostructure Photovoltaic Diode

Jia

et al. 2016

Nano Lett.

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A heterostructure photovoltaic diode featuring an all-solid-state TiO2/graphene/dye ternary interface with high-efficiency photogenerated charge separation/transport is described here. Light absorption is accomplished by dye molecules deposited on the outside surface of graphene as photoreceptors to produce photoexcited electron-hole pairs. Unlike conventional photovoltaic conversion, in this heterostructure both photoexcited electrons and holes tunnel along the same direction into graphene, but only electrons display efficient ballistic transport toward the TiO2 transport layer, thus leading to effective photon-to-electricity conversion. On the basis of this ipsilateral selective electron tunnelling (ISET) mechanism, a model monolayer photovoltaic device (PVD) possessing a TiO2/graphene/acridine orange ternary interface showed ∼86.8% interfacial separation/collection efficiency, which guaranteed an ultrahigh absorbed photon-to-current efficiency (APCE, ∼80%). Such an ISET-based PVD may become a fundamental device architecture for photovoltaic solar cells, photoelectric detectors, and other novel optoelectronic applications with obvious advantages, such as high efficiency, easy fabrication, scalability, and universal availability of cost-effective materials.

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confidence: 99%

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High-Efficiency Selective Electron Tunnelling in a Heterostructure Photovoltaic Diode

Jia

et al. 2016

Nano Lett.

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“…As the interfacial hole transfer is the rate‐limiting process for most photovoltaic devices, the transient photovoltage method was used to explore such rate‐limiting hole transfer processes in ISET‐based photovoltaic devices . With photoexcitation by a 532 nm pulse laser, the transient photovoltage spectrum of the Z907/SLG/TiO 2 photovoltaic device was monitored by an oscilloscope . As shown in Figure b, the transient photovoltage rise times of the devices are well fitted to a double‐exponential curve as follows: V = 24.09 − 14.93 × exp(− t /113.81) − 14.15 × exp(− t /339.69) with a mean square error of 0.9513, where V is the transient photovoltage value in unit of millivolt (mV) and t is the evolution time in unit of microsecond ( µ s).…”

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Photovoltaic Conversion at Selective Electron Tunneling Heterointerfaces

Jia

Guan

et al. 2017

Adv Elect Materials

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particular, highly efficient photogenerated electron-hole pair separation, transport, and collection at the heterointerface are the key to achieve high photon-to-current conversion efficiency for photovoltaic devices. [12][13][14][15] Therefore, interface engineering was widely applied to control the photoinduced charge transport processes at the heterointerface for improving the performance of photovoltaic devices. [16][17][18][19] Recently, we discovered an ipsilateral selective electron tunneling (ISET) mechanism, which can be used to effectively separate photoinduced electron-hole pair at the heterointerface. [20,21] Specifically, when photoactive materials are assembled on the outside surface of single-layer graphene (SLG)/TiO 2 , Schottky diode, photoexcited electrons, as well as holes produced from the photoactive materials transport along the same direction to SLG, whereas only electron can further inject into the TiO 2 layer, thus realizing photogenerated electron-hole pair separation at the Schottky interface. With acridine orange (AO) dye as a model photoactive material, ≈86.8% photocarriers separation/collection efficiency was realized at the AO/SLG/ TiO 2 interface. Therefore, such an ISET effect at the heterointerface has great potential to be applied for efficient photovoltaic conversion.Due to a highly photoactive and unique amphiphilic structure, Z907 ruthenium molecules were widely used as the dye sensitizer in all-solid-state dye-sensitized solar cells. [22] In this work, Z907 molecules were chosen as the photoactive material to construct a Z907/SLG/TiO 2 ternary interface. As shown in Figure 1a, the photoexcited electrons in Z907 molecules are expected to tunnel across SLG and ballistically inject into the conductance band (CB) of the TiO 2 semiconductor layer, while photoexcited holes in Z907 molecules can only transport to the SLG semimetal layer. After that, the electron and hole are collected by the TiO 2 layer and the SLG layer, respectively, and further transport to the outside circuit for photoelectric conversion. Based on such an ISET mechanism, the electron transparency of the graphene layer is crucial for the high-efficiency photovoltaic conversion in ISET-based photovoltaic devices. Considering the fact that the electron transparency decreases with increasing the thickness of graphene, [23] single-layer graphene was chosen to construct the ISET-based heterointerface. With such an ISET-based heterointerface, we investigated the photoinduced carrier dynamic processes and photoelectric conversion performances at the heterointerface.Effectively controlling photoinduced charge transport at the heterointerface is of crucial importance for improving the performance of photovoltaic devices. On the basis of an ipsilateral selective electron tunneling (ISET) mechanism, here this study investigates photoinduced charge transport and photovoltaic conversion at a simplified dye/single-layer graphene (SLG)/TiO 2 ternary interface. With an amphiphilic Z907 molecule as the model dye, the photoexcit...

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“…TPV Measurements. The TPV measurement setup was described in detail in our previous work, 40 with ITO and silver as the positive and negative electrodes, respectively. The positive (or negative) voltage signals will be obtained when the holes (or electrons) are spatially nearer to the ITO electrode than the electrons (or holes).…”

Section: Methodsmentioning

confidence: 99%

Tunable Exciton Dissociation at the Organic/Metal Electrode Interface

Chen

et al. 2015

J. Phys. Chem. C

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Understanding of the dynamic optoelectronic processes at the organic/ metal electrode interface is crucial to the interface engineering of organic electronics. Here we present the systematic studies of exciton dissociation of p-type organic semiconductor at the organic/Ag interface. The interfacial dissociation of photogenerated excitons at the N,N′-di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB)/Ag interface was systematically investigated using the transient photovoltage technique as a proof-ofconcept. The results indicate that two types of exciton dissociationtransfer of either electrons or holes to the metal electrodecoexist at the organic/metal electrode interface. This conclusion is further confirmed by two additional experimentsthe current response of the NPB/Ag interface to light illumination under constant biases and the successive light current−voltage measurements under constant illumination. Moreover, the proportion of two types of dissociations was found to be tunable upon the oxidation of the silver electrode or the insertion of a lithium fluoride interlayer to the NPB/Ag interface. These results may be useful for interface engineering of organic photovoltaic cells.

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High-bandwidth, high-sampling-rate, low-noise, two-probe transient photovoltage measuring system

Cited by 6 publications

References 19 publications

High-Efficiency Selective Electron Tunnelling in a Heterostructure Photovoltaic Diode

High-Efficiency Selective Electron Tunnelling in a Heterostructure Photovoltaic Diode

High‐Efficiency Photovoltaic Conversion at Selective Electron Tunneling Heterointerfaces

Tunable Exciton Dissociation at the Organic/Metal Electrode Interface

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