Enhanced Photocurrents of Photosystem I Films on p‐Doped Silicon

LeBlanc, Gabriel; Chen, Gongping; Gizzie, Evan A.; Jennings, G. Kane; Cliffel, David E.

doi:10.1002/adma.201202794

Cited by 108 publications

(133 citation statements)

References 20 publications

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“…Self assembled monolayers (SAMs) are typically used in many PSI photocurrent studies [ 8,9 ] to preserve the protein structure on the electrode surface and maintain activity but they suffer from poor electrical conductivity, thereby limiting photocurrent. [ 10 ] PSI has also been shown to produce photocurrents on semiconductor electrodes such as TiO 2 /ZnO [ 11 ] and p-doped silicon, [ 12 ] as well as in osmium redox polymers. [ 13 ] Photocurrents in these devices range from ∼ 10 nA cm −2 [ 9 ] to 875 µA cm −2 .…”

Section: Doi: 101002/adma201402375mentioning

confidence: 98%

“…[ 13 ] Photocurrents in these devices range from ∼ 10 nA cm −2 [ 9 ] to 875 µA cm −2 . [ 12 ] Most studies reporting photocurrents above 1 µA cm −2 have used thick PSI fi lms (1-2 µm) and often have dried these fi lms to pack large amounts of protein per unit area. [ 8,11,12 ] In one study, a conductive osmium polymer hydrogel was deposited with PSI to generate photocurrents of 29 µA cm −2 .…”

Section: Doi: 101002/adma201402375mentioning

confidence: 99%

“…[ 12 ] Most studies reporting photocurrents above 1 µA cm −2 have used thick PSI fi lms (1-2 µm) and often have dried these fi lms to pack large amounts of protein per unit area. [ 8,11,12 ] In one study, a conductive osmium polymer hydrogel was deposited with PSI to generate photocurrents of 29 µA cm −2 . [ 13 ] Oriented PSI monolayers have been demonstrated on electrode surfaces both through the use of His-tagged PSI bound to Ni-nitrilotriacetic acid (NTA) modifi ed SAMs, [ 14 ] and through the deposition of intact thylakoid membranes, [ 15 ] however these methods produce relatively low photocurrents.…”

Section: Doi: 101002/adma201402375mentioning

confidence: 99%

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Two‐Dimensional Protein Crystals for Solar Energy Conversion

et al. 2014

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Two-dimensional photosynthetic protein crystals provide a high density of aligned reaction centers. We reconstitute the robust light harvesting protein Photosystem I into a 2D crystal with lipids and integrate the crystals into a photo-electrochemical device. A 4-fold photocurrent enhancement is measured by incorporating conjugated oligoelectrolytes to form a supporting conductive bilayer in the device which produces a high photocurrent of ∼600 μA per mg PSI deposited.

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Section: Doi: 101002/adma201402375mentioning

confidence: 98%

Section: Doi: 101002/adma201402375mentioning

confidence: 99%

Section: Doi: 101002/adma201402375mentioning

confidence: 99%

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Two‐Dimensional Protein Crystals for Solar Energy Conversion

et al. 2014

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“…Also shown is the linear curve extrapolated from U a (z) in the vacuum between the charged sheet and the slab's virtual surface [U vac (z); red dashed line]. molecular acceptor [13,14], enhancement of the photocurrent of a photosystem-1 film on Si [15], and the doping sensitivity of (2 × 4) reconstructions at the GaAs(001) surface [16] and (2 × 1) reconstructions at the Si(111) surface [17,18]. The first-principles simulation of doped semiconductor surfaces has been addressed in recent literature using different approaches.…”

Section: Introductionmentioning

confidence: 99%

Multiscale approach to the electronic structure of doped semiconductor surfaces

et al. 2015

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The electronic effects of semiconductor doping pose a unique challenge for first-principles simulations, because the typically low concentration of dopants would require intractably large system sizes in an explicit atomistic treatment. In systems which do not display longrange band bending, a satisfactory remedy is offered by the use of "pseudoatoms", with a fractional nuclear charge matching the bulk doping concentration. However, this alone is insufficient to account for charged semiconductor surfaces in the general case, where the associated space-charge region (SCR) may be very wide relative to tractable simulation dimensions. One generalization of the pseudoatom approach which overcomes this difficulty relies on the introduction of an artificially high doping level within a slab calculation, in conjunction with a multi-scale electrostatic energy correction. Here, we present an alternative technique that naturally extends the pseudoatom approach while bypassing the need for calculations with an unrealistically high doping level. It is based on the introduction of a two-dimensional sheet of charge within a slab-based surface calculation, which mimics the SCR-related field, along with free charge such that the system is neutral overall. The amount of charge involved is obtained from charge conservation and Fermi level equilibration between the bulk, treated semi-classically, and the electronic states of the slab/surface, which are treated quantum-mechanically. The method, which we call CREST -the Charge-Reservoir Electrostatic Sheet Technique -can be used with standard electronic structure codes. We validate the approach using a simple tight-binding model, which allows for comparison of its results with calculations encompassing the full SCR explicitly. Specifically, we show that CREST successfully predicts scenarios spanning the full range from no to full Fermi-level pinning. We then employ it with density functional theory, where it is used to obtain insights into the electronic structures of the "clean-cleaved" Si(111) surface and its buckled (2x1) reconstruction, at various doping densities.

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“…sphaeroides [4][5][6][7][8]10,[18][19][20][21][22][23]. Major preoccupations of this work have been the development of strategies for effective interfacing of the positive and negative terminals of the photovoltaic protein to the working and counter electrode, either through direct binding or the use of diffusional mediators [4][5][6][7][8][16][17][18][19][20][21][22][23][24][25][26][27]. In the case of RC's from purple bacteria a particularly effective strategy has been to use analogues of the natural electron donor and electron acceptor, cytochrome (cyt) c2 and ubiquinone-10 (UQ10), to connect the photovoltaic protein to the two electrodes [18,20,22,[27][28][29].…”

mentioning

confidence: 99%