Stable semi-transparent CH3NH3PbI3 planar sandwich solar cells

Author(s): Jin Hyuck Heo ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Hye Ji Han ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Minho Lee ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Myungkwan Song ⁶ ^, ⁷ ^, ⁵ , Dong Ho Kim ⁶ ^, ⁷ ^, ⁵ , Sang Hyuk Im ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Energy & Environmental Science

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Semi-transparent MAPbI ₃ planar sandwich solar cells were fabricated by simply laminating an F doped tin oxide/TiO ₂/MAPbI ₃/wet hole transporting material with additives and PEDOT:PSS/indium tin oxide (ITO).

Abstract

Semi-transparent CH ₃NH ₃PbI ₃ (MAPbI ₃) planar sandwich solar cells could be fabricated by simply laminating an FTO (F doped tin oxide)/TiO ₂/MAPbI ₃/wet hole transporting material (HTM) with additives and PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid))/indium tin oxide (ITO). The best FTO/TiO ₂/MAPbI ₃/P3HT with additives/PEDOT:PSS/ITO planar sandwich structured solar cells exhibited a 12.8% (deviation: 11.7% ± 0.74%) average power conversion efficiency ( η _avg) but poor visible transmittance due to strong absorption by P3HT. Meanwhile, the semi-transparent FTO/TiO ₂/MAPbI ₃/PTAA with additives/PEDOT:PSS/ITO planar sandwich solar cells exhibited a 15.8% (deviation: 14.45% ± 0.76%) η _avg without significant J– V hysteresis with respect to the forward and reverse scan directions. The average visible transmittance (AVT) was controlled from 17.3% to 6.3% and the corresponding η _avg changed from 12.55% to 15.8%. The unsealed sandwich planar perovskite solar cells exhibited great air and humidity stability over 20 days due to the self-passivated device architecture of the sandwich type device.

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Anomalous Hysteresis in Perovskite Solar Cells.

Henry J Snaith, Antonio Abate, James M Ball … (2014)

Perovskite solar cells have rapidly risen to the forefront of emerging photovoltaic technologies, exhibiting rapidly rising efficiencies. This is likely to continue to rise, but in the development of these solar cells there are unusual characteristics that have arisen, specifically an anomalous hysteresis in the current-voltage curves. We identify this phenomenon and show some examples of factors that make the hysteresis more or less extreme. We also demonstrate stabilized power output under working conditions and suggest that this is a useful parameter to present, alongside the current-voltage scan derived power conversion efficiency. We hypothesize three possible origins of the effect and discuss its implications on device efficiency and future research directions. Understanding and resolving the hysteresis is essential for further progress and is likely to lead to a further step improvement in performance.

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Organometallic Halide Perovskites: Sharp Optical Absorption Edge and Its Relation to Photovoltaic Performance.

Stefaan De Wolf, Jakub Holovský, Soo-Jin Moon … (2014)

Solar cells based on organometallic halide perovskite absorber layers are emerging as a high-performance photovoltaic technology. Using highly sensitive photothermal deflection and photocurrent spectroscopy, we measure the absorption spectrum of CH3NH3PbI3 perovskite thin films at room temperature. We find a high absorption coefficient with particularly sharp onset. Below the bandgap, the absorption is exponential over more than four decades with an Urbach energy as small as 15 meV, which suggests a well-ordered microstructure. No deep states are found down to the detection limit of ∼1 cm(-1). These results confirm the excellent electronic properties of perovskite thin films, enabling the very high open-circuit voltages reported for perovskite solar cells. Following intentional moisture ingress, we find that the absorption at photon energies below 2.4 eV is strongly reduced, pointing to a compositional change of the material.