[12] According to Shockley-Quiesser limit, solar cell efficiency of semiconductors depend on the band gap of the material. We chose a diketopyrrolopyrrole-based low bandgap polymer pDPP5T-2 (abbreviated as DPP) blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) as the photoactive layer of the two front subcells16,17, because the main absorption of this heterojunction extends to the near-infrared range with an absorption minimum between 450 and 650nm (Supplementary Fig. 135, 55295532 (2013) . All the individual layers of the solar cell can be clearly distinguished in the scanning TEM (STEM) image without any physical damage. Nat. This rate of recombination plays a negative role in the efficiency. Shockley-Queisser Limit - PlasmaSolaris Due to the well-matched VOC between the perovskite cell and the series-connected tandem cell, the photocurrent delivered by the organic tandem cell, up to 2mAcm2, directly contributes to the performance enhancement of the perovskite cell. Commun. On top of the dried PEDOT:PSS, the first photoactive layer consisting of DPP and PC60BM (1:2 wt.% dissolved in a mixed solvent of chloroform and o-dichlorobenzene (9:1 vol.%)) was deposited at 45C to obtain a thickness of 50nm. 92, 41174122 (2002) . (At that value, 22% of the blackbody radiation energy would be below the band gap.) Science 334, 15301533 (2011) . N.p. 3, 10621067 (2013) . The origin of high efficiency in low-temperature solution-processable bilayer organometal halide hybrid solar cells. Soc. Triple-junction hybrid tandem solar cells with amorphous silicon and polymer-fullerene blends. volume6, Articlenumber:7730 (2015) Modeling photocurrent action spectra of photovoltaic devices based on organic thin films. Energy Environ. 23, 41774184 (2013) . 3. Normally these are provided through an electrode on the back surface of the cell. . These cells require the use of semiconductors that can be tuned to specific frequencies, which has led to most of them being made of gallium arsenide (GaAs) compounds, often germanium for red, GaAs for yellow, and GaInP2 for blue. Rep. 4, 7154 (2014) . High-performance semitransparent perovskite solar cells with solution-processed silver nanowires as top electrodes. Sunlight can be concentrated with lenses or mirrors to much higher intensity. (a) Equivalent electronic circuit of the series/series (SS) triple-junction organic solar cells. Second, the VOC of the back cell, which is consisting of a series-connection of deep NIR absorbers, can be custom fabricated by stacking an arbitrary sequence of semiconductors with different bandgaps in series.

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