Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Patent
1995-12-08
1997-12-16
Nakarani, D. S.
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
136252, 136255, 257 40, 257431, 257449, 428457, 428461, 428913, H01L 3100
Patent
active
056980485
ABSTRACT:
A photoresponsive material comprises molecular or polymeric semiconductors in which photogeneration of separated charge carriers proceeds substantially via an intermediate stage of a triplet exciton, where the generation of the triplet exciton may be facilitated by the presence of elements of high atomic number, and in which the generation of separated charges from the intermediate triplet excited states is facilitated by the presence of at least two semiconductive components, one of which is of high electron affinity and able to accept electrons, and the other of which is of low ionisation potential and therefore able to accept positive charge carriers, the difference between the electron affinity of the former and the ionisation potential of the latter being sufficiently low so as to allow the ionisation of a triplet exciton which is present on either of the two aforementioned semiconductive components or on a third component. The provision of contact electrodes allows charge to be collected by an external electrical circuit and allows light to be incident on the active photoresponsive material.
REFERENCES:
patent: 5171373 (1992-12-01), Hebard et al.
A. Kohler, H.F. Wittmann, R.H. Friend, M.S. Khan, J. Lewis, "The photovoltaic effect in a platinum poly-yne." Synthetic Metals,, vol. 67, No. 1/3, Nov. 1994, Lausanne, CH, , pp. 245-249.
G. Yu, K. Pakbaz, and A.J. Heeger, "Semiconducting polymer diodes: Large size, low cost photodetectors with excellent visible-ultraviolet sensitivity." Applied Physics Letters, vol. 64, No. 25, 20 Jun. 1994, New York US, pp. 3422-3424.
N.S. Sariciftci, L. Smilowitz, A.J. Heeger and F. Wudl, "Semiconducting polymers (as donors) and buckminsterfullerene (as acceptor): photoinduced electron transfer and heterojunction devices." Synthetic Metals, vol. 59, No. 3 Aug. 1993, Lausanne, CH, pp. 333-352.
H.F. Wittmann, K. Fuhrmann, R.H. Friend and M.S. Khan and J. Lewis, "Optical Excitations in Transition Metal Containing Poly-ynes." Synthetic Metals, vol. 55, No. 1, 15 Mar. 1993, Lausanne, CH pp. 56-61.
H.R. Wittmann, and R. H. Friend ,and M.S. Khan and J. Lewis, "Optical spectroscopy of platinum and palladium containing poly-ynes." Journal Of Chemical Physics, vol. 101, No. 4, 15 Aug. 1994, New York USA, pp. 2693-2698.
Friend Richard
Kohler Annette
Cambridge Display Technology Limited
Nakarani D. S.
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