Driving charge separation for hybrid solar cells: photo-induced hole transfer in conjugated copolymer and semiconductor nanoparticle assemblies

Wang, Y.; Liu, K.; Mukherjee, Prasun; Hines, Douglas A.; Santra, Pralay K.; Shen, Haoyue; Kamat, Prashant V.

doi:10.1039/c3cp55210a

Cited by 12 publications

(15 citation statements)

References 38 publications

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“…In every case, the donor CA-CdTe has a smaller band gap so that Förster energy transfer is not significant. Additionally, only the donor nanoparticle is excited to ensure that electron transfer rather than hole transfer is observed . The relative conduction and valence bands for the Type I and Type II systems utilized in this distance-dependent study were calculated in a manner similar to that described above.…”

Section: Resultsmentioning

confidence: 99%

Electron Transfer in Nanoparticle Dyads Assembled on a Colloidal Template

2016

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This work shows how to create covalently bound nanoparticle dyad assemblies on a colloidal template and studies photoinduced charge transfer in them. New results are reported for how the electron-transfer rate changes with the inter-nanoparticle distance and the energy band offset of the nanoparticles (reaction Gibbs energy). The experimental findings show that the distance dependence is consistent with an electron tunneling mechanism. The dependence of the rate on the energy band offset is found to be consistent with Marcus theory, as long as one performs a sum over final electronic states. These results indicate that our understanding of electron transfer in molecular donor-bridge-acceptor assemblies can be translated to describe nanoparticle-bridge-nanoparticle assemblies.

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Section: Resultsmentioning

confidence: 99%

Electron Transfer in Nanoparticle Dyads Assembled on a Colloidal Template

2016

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“…On the other hand, the inversed charge of CdSe QDs surface provided a driving force to interact with negatively charged HA − by electrostatic interaction. The as-generated secondary coordination sphere strengthened the association of HA − with CdSe QDs, which in turn accelerated the hole transfer from CdSe QDs to HA − 48 .…”

Section: Resultsmentioning

confidence: 99%

Secondary coordination sphere accelerates hole transfer for enhanced hydrogen photogeneration from [FeFe]-hydrogenase mimic and CdSe QDs in water

Wen

Jian

et al. 2016

Sci Rep

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Achieving highly efficient hydrogen (H2) evolution via artificial photosynthesis is a great ambition pursued by scientists in recent decades because H2 has high specific enthalpy of combustion and benign combustion product. [FeFe]-Hydrogenase ([FeFe]-H2ase) mimics have been demonstrated to be promising catalysts for H2 photoproduction. However, the efficient photocatalytic H2 generation system, consisting of PAA-g-Fe2S2, CdSe QDs and H2A, suffered from low stability, probably due to the hole accumulation induced photooxidation of CdSe QDs and the subsequent crash of [FeFe]-H2ase mimics. In this work, we take advantage of supramolecular interaction for the first time to construct the secondary coordination sphere of electron donors (HA−) to CdSe QDs. The generated secondary coordination sphere helps realize much faster hole removal with a ~30-fold increase, thus leading to higher stability and activity for H2 evolution. The unique photocatalytic H2 evolution system features a great increase of turnover number to 83600, which is the highest one obtained so far for photocatalytic H2 production by using [FeFe]-H2ase mimics as catalysts.

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“…Thus, when mixed with organic photoactive components, they can provide an interfacial force driving the dissociation of excitons generated in the organic materials in free charge. [1387][1388][1389][1390] Therefore, inorganic nanocrystals can act as ideal acceptor materials in BHJ OSC-like devices using either organic polymers or conjugated small molecules as the donors. [1378][1379][1380][1381][1382][1383][1384]1391 The first hybrid SC was reported in 1996 using CdSe nanodots as the acceptor and poly[2-methoxy-5-(2 0 -ethylhexyloxy)-pphenylene vinylene] (MEH-PPV) as the donor.…”

Section: Organic-inorganic Hybrid Scsmentioning

confidence: 99%