The recent emergence of efficient solar cells based on organic/inorganic lead halide perovskite absorbers promises to transform the fields of dye-sensitized, organic, and thin film solar cells. The goal of the project is to fabricate large area, pin hole free, uniform, highly efficient, reproducible and stable perovskite solar cells. We try to understand the device physics by probing charge generation, transport, collection and recombination through various spectroscopic and electrical techniques. Apart from regular fabrication and characterization of the devices, we develop novel technologies to optimize the morphology in these solar cells as well study charge carrier dynamics and photophysics by steady state and time resolved techniques.
Large charge carrier mobility plays an important role in designing highly efficient solar cells. Hole transport Materials like P3HT(Poly(3-hexylthiophene-2,5-diyl) and some low bandgap polymers are investigated in this regard to find the mobility. Investigation of its charge carrier mobility is done by Space charge limited currents (SCLC) and Time of flight (TOF) methods. Our main aim is to make the thin films of these hole transport materials in such a way so that the mobility can be large.
Recently, significant progress has been achieved in the development of bulk heterojunction (BHJ) solar cells as a viable low-cost alternative energy source. However, it is still of a great challenge to achieve an optimal morphology in the active layer with appropriate domains for the donors and acceptors in a controllable way. A controllable morphology and photophysics with proper domain sizes could be accomplished by employing nanoparticles (NPs) of low bandgap polymers and acceptors. We synthesize organic nanoparticles, study their charge carrier mobility, investigate their photophysical and morphological properties, and assemble them in bulk-heterojunction solar cells.
Dye sensitized solar cells (DSSCs) or Grätzel cells have attracted considerable research interest due to their low cost, ease of fabrication and environmental friendliness. We use different natural dyes as sensetizers and novel engineered carbon nanomaterials as counter electrode in DSSC.