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Photosynthesis, a process by which plants convert sunlight, water, and carbon dioxide into biomass, is key to the sustenance of nearly every form of life on earth. At the heart of this process are the photosynthetic pigment-protein complexes that transduce solar energy into biologically useful forms of energy through a photochemical charge separation that has a quantum efficiency close to 100%. Although the protein complexes exhibit a near-unity quantum efficiency in their native environments, achieving a similar photoelectric performance by integrating them in device environments, without losing their integrity, has been a challenge. Despite numerous efforts in the past decade on various bio-photovoltaic systems integrating purple-bacterial proteins, there has not been a satisfactory advance in the photocurrent generation in the devices. With most the reported devices being liquid electrochemical cells, challenges in getting high photocurrents in such typically stem from the limitations imposed by low light absorbance of proteins dispersed in liquid electrolytes and/or slow long-range diffusion of liquid-phase charge carriers. In this talk, I will give an overview of some of the works that enhance the photocurrent density, open-circuit voltage and stability achievable by pigment-proteins in bio-hybrid photovoltaic devices over the last few years.

 

A new mixing cation system for tin based perovskite that boost the power conversion efficiency from 4.0% to 8.5 % and increases the stability of the cell significantly. The modified perovskite cell can maintain almost 80% of their initial efficiency after 100 hours in RH=50% and T=20 ⁰C.

 

Perovskite solar cells have been a promising high efficiency solar cell and the efficiency increases rapidly. We applied our solver for electrical simulation and use our FDTD program for optical absorption. Finally, we design a nano-structure that have efficiency of MAPBI$_{3}$ based solar cell has been improved to 19.67%.