Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Solar cells consisting of metal-halide perovskite thin films show great energy harvesting capabilities in terrestrial photovoltaic installations.[1][2] We utilize Fourier-transform photocurrent spectroscopy (FTPS) to understand the temperature-dependence of photocurrent spectra of CH3NH3PbI3 devices. Interestingly we find that there are clear features in the low-temperature photocurrent spectra that indicate photocurrent contribution from PbI2. The evidence of PbI2 in the photocurrent spectra at low temperature shows that PbI2 plays a dynamic role (other than passivation) in CH3NH3PbI3 solar cells. Moreover, at 15 K exciton formation leads to a blue-shift in the photocurrent-onset with respect to the absorption onset. At such low temperatures, there is very little photocurrent contribution from the excitonic states.[3] Hence our low temperature photocurrent and absorption measurements of CH3NH3PbI3, allow us to extract a lower limit on the exciton binding energy of 9.1 meV for CH3NH3PbI3.[4] Additionally, we assess the device characteristics of the prototypical perovskite solar cells based on CH3NH3PbI3 over a temperature range from 15 K to 350 K. We observe a peak in the short circuit current and open circuit voltage at 200 K with reasonable operation maintained up to 350 K. However, the device current-voltage characteristics are significantly poor below 200 K with the short circuit current dropping by over 5 orders of magnitude at 15 K.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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