Publication date: 8th January 2019
Morphology, microstructure and composition of perovskite crystals play an essential role in solar cells applications, having a remarkably influence on the device efficiency. This work explore a new methodology to incorporate a subphthalocyanine molecule (SubPc) in a lead bromide perovskite crystal structure. This process consist in the preparation of quasi-3D perovskite, modifying the ratio of the organic cations A/R in the structure of perovskite ((R)2(A)n-1BnX3n+1) and obtaining from layered to 3D materials.
The incorporation of SubPc as a doping material in the perovskite was studied with different characterization techniques, i.e. Scanning Electron Microscope (SEM), ICP, UV-absorption and X-Ray Diffraction (XRD). Afterwards, optical and electrical properties have been characterized showing remarkable results. For example, optical measurements show a combination of the characteristic absorption and luminescence properties. Regarding electrical measurements, a photocurrent spectrum with a broad absorption in the visible range with a new band at 650 nm, characteristic of the SubPc molecule, and confirming the presence of these molecules inside the perovskite crystals.
Furthermore, this new hybrid material has been implemented in complete photovoltaic devices, showing an enhancement in the efficiency when SubPC has been incorporated inside perovskite crystals. However, IPCE characterization does not show the total contribution of the SubPc. Probably this effect is derived from the processing the photovoltaics devices. Future work will be focused in understanding this behavior.
Financial support from the Spanish Ministry of Economy and Competitiveness (Severo Ochoa, SEV-2016-0683), Intramural CSIC project 201680I006, and Fundación Ramón Areces (XVII Concurso Nacional para la adjudicación de Ayudas a la Investigación en Ciencias de la Vida y de la Materia) is gratefully acknowledged. Financial support was also provided by the Spanish Ministry of Economy and Competitiveness (Mineco) of Spain (TEC2015-74405-JIN), MAT2015-69669- P, and regional government grant PrometeoII/2017/026.
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