Sorumlu APYK: ODTÜ-GÜNAM – IMEC (Belçika)
Proje Yürütücüsü: Tom AERNOUTS (IMEC); Doç. Dr. Selçuk YERCİ (ODTÜ-GÜNAM)
This project will be conducted by ODTU-GUNAM and imec to upscale fabrication of large area semitransparent methyl ammonim-free perovskite solar modules. The final product of this project will be large area semitransparent perovskite solar cell which is stabilized at the highest record efficiency with 16×16 cm-2 active area. The developed perovskit module can be the heart of the 4T perovskite/Si tandem solar cell with power conversion efficiency of over 17%. The project is planned to be completed through 3 work packages split into several specific tasks done at GUNAM and imec. 1) Development of semitransparent small area: The tasks in this work package comprise small area (<0.5 cm2) perovskite solar cells fabricated on small area (<3 cm2) with sputtered HTL on top of ITO/glass, sequentially deposited cesium-formamidinium perovskite layer, evaporated ETL and blocking layer, and soft sputtered transparent ITO. Enhancing the efficiency and stability will also be thoroughly investigated for the fabricated devices. The concerns rising from the encapsulation for long term stability will be thoroughly investigated. These tasks will be fulfilled both in GUNAM and imec in different scales within a complementary framework. Scaling up to large area semitransparent module: The active area reached in the work package 1 will be enlarged to reach the final 16*16 cm-2, while presenting high efficiency, by incorporation of additives such as surfactants for higher hydrophilicity, solvent engineering, several deposition and annealing conditions for
grains engineering in large area devices. 3). Laser patterning: modules require the sectioning into multiple cells for series interconnection. The semi-transparent perovskite top modules will be monolithically interconnected via conventional P1-P2-P3 scribing configuration. The P1 line separates the substrate electrode (indium tin oxide (ITO) in our case), the P2 line removes the semiconductor from the ITO to allow
the formation of a low ohmic contact between the top and bottom electrodes, and finally, the P3 line separates the top electrode between the single cells. The area between the P1 and P3 lines is PV inactive, or so-called “dead area”. Typically, the dead area is accounted for the module efficiency by the geometrical fill factor (GFF), which is the ratio between the PV active area and the total module area. The larger the dead area, the smaller the GFF and the lower the module efficiency. Optimization of this step requires highest resolution of the P1, P2, and P3 lines with minimizing the dead area resulting from laser patterning.