The wide bandgap makes methylammonium lead iodide (MAPbI3) a suitable candidate for semi-transparent perovskite solar cells (ST-PSCs). Moreover, ultra-thin perovskite films prepared to achieve semi-transparent will compromise the quality of...

Efficiency Improvement of Semi-transparent Perovskite Solar Cells via Crystallinity Enhancement

Semitransparent perovskite solar cells are important for building‐integrated photovoltaics. Most research is focused on glass substrates, which can be utilized as glass windows during the construction of the buildings. Herein, the fabrication of flexible and semitransparent perovskite‐based solar cells is presented, which can be used for existing windows as retrofitting process. The transparency of the cells is obtained through printing transparent and noncolored “optical holes” at micrometric dimensions. The fabrication approach is based on inkjet printing pillars composed of polymerized N‐vinylcaprolactam, followed by inkjet printing of a perovskite layer, to attain a digitally tuned semitransparency, all performed in open air. The printing compositions are tailored, including the solvents with a controlled volatility, and adding a surfactant to fit both the inkjet printing process and the vacuum‐assisted perovskite crystallization. The flexible semitransparent solar cells achieve a power conversion efficiency (PCE) of 9.14%, with an average transmittance of 29.3%. Beyond transparency, the pillars also contributed to the mechanical properties: bending measurements reveal that the device without the pillars retains 71.4% of the PCE after 300 cycles compared to the pillared device which retains 90% of its initial PCE after 500 bendings.

Inkjet‐Printed Flexible Semitransparent Solar Cells with Perovskite and Polymeric Pillars

Silicon solar cells have the advantages of non-toxicity, reliability, low price, and stability. Microlens arrays (MLAs) are widely used in solar cells to improve photoelectrical conversion efficiency (PCE). In this research, different MLAs mold was designed by a method of thermal reflow. Then the photoresist film MLAs structure was replicated on the surface of silicon solar cells through UV nanoimprint technology. The optical transmission and surface morphology of these photoresist films were respectively measured by using a UV spectrometer and an atomic force microscope. The surface morphology and imaging capabilities of photoresist film MLAs were respectively measured by using a scanning electron microscope and optical microscope. Finally, the photovoltaic performance of the silicon solar cell with the photoresist film MLAs was investigated, and the PCE value of the silicon solar cell improved from 11.53% for the sample without MLAs to 13.19% for the sample with the square MLAs and the PCE improvement is about 14.40%. All these results above show that the photoresist film MLAs can significantly improve the efficiency of silicon solar cells and have great application potential in the field of solar cells.

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Photoresist Microlens Arrays Fabricated by Nanoimprint Technique to Improve the Photoelectric Conversion Efficiency of Solar Cells

Defect passivation engineering for achieving 4.29% light utilization efficiency MA-free wide-bandgap semi-transparent perovskite solar cells

Transparent photovoltaics: Overview and applications

Semitransparent perovskite solar cells (STPSCs) continue to attract enormous interest because of their potential to provide low-cost renewable energy for building and automotive applications. Whilst many studies have shown that...

High efficiency semitransparent perovskite solar cells containing 2D nanopore arrays deposited in a single step

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High efficiency semitransparent perovskite solar cells containing 2D nanopore arrays deposited in a single step