Self-passivated carbon dots derived from Bougainvillea spectabilis for photovoltaic application

The article delves into the synthesis and application of self-passivated carbon dots derived from Bougainvillea spectabilis flowers. The authors employ a solvothermal method to produce these carbon dots, which exhibit exceptional optical and electrical properties. The study meticulously analyzes the optical absorption and fluorescence characteristics of the carbon dots, revealing their potential for use in photovoltaic devices. The carbon dots, with an average size of 9.81 nm, show tunable emission upon excitation and exhibit excellent stability, as evidenced by their zeta potential of -32.4 mV. The authors integrate these carbon dots into a sensitized solar cell, achieving an open circuit voltage of 0.62 V and a short circuit current density of 0.45 mA cm-2. The device demonstrates light responsiveness and stability over an extended period, making it suitable for indoor applications. The study also suggests that these carbon dots could function as co-sensitizers to enhance the absorption window of solar cells. Overall, the article presents a comprehensive exploration of the potential of natural-source carbon dots in photovoltaic applications, offering valuable insights for further research and development in the field.