2014
DOI: 10.1002/adma.201400577
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Effect of Solvent Environment on Colloidal‐Quantum‐Dot Solar‐Cell Manufacturability and Performance

Abstract: The absorbing layer in state-of-the-art colloidal quantum-dot solar cells is fabricated using a tedious layer-by-layer process repeated ten times. It is now shown that methanol, a common exchange solvent, is the main culprit, as extended exposure leaches off the surface halide passivant, creating carrier trap states. Use of a high-dipole-moment aprotic solvent eliminates this problem and is shown to produce state-of-the-art devices in far fewer steps.

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Cited by 91 publications
(148 citation statements)
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“…To gain a better understanding of the effect of the graphitic shell on the emission we compared the shell-covered and oxidized DNDs using photoemission spectroscopy (PES) which allows direct probing of the electronic structure. We have deployed similar methodology in the recently reported PES studies of trap states in lead sulfide (PbS) colloidal quantum dot (CQD) based solar cells [31,32].…”
Section: Resultsmentioning
confidence: 99%
“…To gain a better understanding of the effect of the graphitic shell on the emission we compared the shell-covered and oxidized DNDs using photoemission spectroscopy (PES) which allows direct probing of the electronic structure. We have deployed similar methodology in the recently reported PES studies of trap states in lead sulfide (PbS) colloidal quantum dot (CQD) based solar cells [31,32].…”
Section: Resultsmentioning
confidence: 99%
“…[48][49][50][51][52][53][54][55] We have recently shown that thin film deposition at the solid-liquid interface, solvent vapour annealing and ligand exchange in colloidal quantum dot solids can be monitored using a quartz crystal microbalance with dissipation (QCM-D) capability. [56][57][58] QCM-D measures the change of frequency (∆f) and dissipation (∆D) at the surface of the microbalance in relation to mass deposition or loss and changes in the viscoelastic properties of the 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 10 adsorbed mass, respectively. [59][60][61] For the purpose of our study, we evaluate the rate and extent of P3HT deposition at the solid-solution interface on untreated and OTS-treated SiO 2 -coated quartz sensor using pristine and ultrasonicated (4 min) solutions.…”
Section: P3ht Thin Film Formationmentioning
confidence: 99%
“…The other advantage of the prospective architecture is that it is a tandem cell, utilizing the power of multiple cells connected in series to improve the output efficiency [85]. The commercial advantage of the prospective cell is that it is an easily scalable, solution-based fabrication process that given the appropriate substrates could even be readily adapted to roll-to-roll processing [86] or cell printing [87]. The key to the efficiency demonstrated by photosystem I and potentially achievable with quantum dot-sensitized solar cell is the efficient separation of carriers over macroscopic distances.…”
Section: Conclusion and Future Prospectsmentioning
confidence: 99%