Nanophotovoltaics: QD/organic hybrid pn-junction

Nontoxic and earth-abundant materials used in fabricating photovoltaic devices. Depletion layer formed at the hybrid pn-junction.

CNTs in OPVs as carrier transporting channels

Functionalized carbon nanotubes in donor/acceptor-type photovoltaic devices.

B. Pradhan, S. K. Batabyal, A. J. Pal
Appl. Phys. Lett. 2006, 88, 093106.

This work has been discussed and cited in Wikipedia under “Carbon nanotubes in photovoltaics”
http://en.wikipedia.org/wiki/Carbon_nanotubes_in_photovoltaics

Transport gap and Optical gap

Transport gap of Si has been tuned through surface passivation with a monolayer of nanoparticles. Transport gap of quantum dots can similarly be modified by addition of a monolayer of a dye as a shell-layer.

B. C. Das and A. J. Pal, Appl. Phys. Lett. 2009, 94, 082106
B. Ghosh, B. C. Das, and A. J. Pal, Small 2010, 6, 52

Molecular rectifier; rectification in a nanowire

Assembly of a donor molecule and an acceptor molecule acts as a half-wave organic-rectifier. When dopant was introduced in a section of vertical nanowires,  the nanowire acts ac a rectifier.

K. Mohanta and A. J. Pal, J. Phys. Chem. C 2009, 113, 18047.
K. Mohanta and A. J. Pal, Org. Electron. 2009, 10, 960.

Organic Memory

Electrical bistability and related organic memory in a monolayer of organic molecules observed. The phenomena have been assigned to be due to electroreduction of the molecules with associated conformational change.