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[资源] 染料敏化太阳能电池（DSSC）效率终于突破15%

近期Michael Gratzel课题组终于在染料敏化电池的效率上实现突破。在经过多年10%效率瓶颈后，光电转换效率首次提高到了15%。该论文“Sequential deposition as a route to high-performance perovskite-sensitized solar cells” 最近发表在nature上。

附摘要：
Following pioneeringwork1, solution-processable organic–inorganic
hybrid perovskites—such as CH3NH3PbX3 (X5Cl, Br, I)—have
attracted attention as light-harvesting materials for mesoscopic solar
cells2–15. So far, the perovskite pigment has been deposited in a single
step onto mesoporous metal oxide films using amixture of PbX2 and
CH3NH3X in a common solvent. However, the uncontrolled precipitation
of the perovskite produces large morphological variations,
resulting in a wide spread of photovoltaic performance in the resulting
devices, which hampers the prospects for practical applications.
Herewe describe a sequential depositionmethod for the formation of
the perovskite pigment within the porous metal oxide film. PbI2 is
first introduced from solution into a nanoporous titanium dioxide
filmand subsequently transformed into the perovskite by exposing it
to a solution of CH3NH3I.We find that the conversion occurs within
the nanoporous host as soon as the two components come into contact,
permitting much better control over the perovskite morphology
than is possible with the previously employed route. Using this technique
for the fabrication of solid-state mesoscopic solar cells greatly
increases the reproducibility of their performance and allows us
to achieve a power conversion efficiency of approximately 15 per
cent (measured under standard AM1.5G test conditions on solar
zenith angle, solar light intensity and cell temperature). This twostep
method should provide new opportunities for the fabrication
of solution-processed photovoltaic cells with unprecedented power
conversion efficiencies and high stability equal to or even greater
than those of today’s best thin-film photovoltaic devices.

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附件 1 : sequential_deposition_as_a_route_to_high-performance_perovskite-sensitized_solar_cells.pdf

2013-07-26 14:59:47, 888.92 K