Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
With an unprecedented amount of studies since the first prototype device, to this date, perovskites have demonstrated to be an exciting new material for the next generation photovoltaics. Among this, the evolution from single cation (MA) to multi-cation (Rb, Cs, FA, MA) perovskites has opened new pathways to overcome the challenges in device power conversion efficiency (PCE) as well as stability.
In this work, our study focuses on the improvement of the photovoltaic performance of triple cation perovskite solar cells over time. The devices are prepared with a perovskite composition of Cs0.1(MA0.17FA0.83)0.9Pb(Br0.15I0.85)3 and an electron transport layer (ETL) made of TiO2 nanoparticles. We find that the power output measured at constant voltage close to the MPP is initially very low with a power conversion efficiency (PCE) of around 13%, but enhances over a timescale of days towards a reasonable PCE of >17%. Interestingly, the enhancement of the stable power output occurs simply by storing the devices in the dark and a temperature-controlled nitrogen-filled glove-box. Moreover, the photovoltaic performance of the devices improves and the increased PCE remains stable at 17.5% even after an extended period of up to > 5 months under dark in the glove-box condition.
In order to obtain insights into the underlying mechanisms of this effect, we study systematically the morphology, crystallinity and optoelectronic characteristics of the samples by a series of X-ray diffraction (XRD) and photoluminescence (PL) spectroscopy in the first day of sample preparation and also after a storage period (some few days). The optoelectronic characterizations exhibit a significant increase in the PL intensity and the lifetime of the charge carriers during this storage time. This suggests a reduction in the non-radiative recombination through trap states within the perovskite layer, which seems to be related to morphological changes in the perovskite film. Furthermore, the XRD measurements (collected over a storage time of few days), indicate a change in the relative intensity of the two typical perovskite reflection peaks (at 2θ ~14° and ~20°). This is considered as a change in the dominant orientation of the crystals in the perovskite layer that could lead to a reduction in the density of the trap states.
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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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