TY - JOUR A1 - Schultz, Christof A1 - Fenske, Markus A1 - Dion-Bertrand, Laura-Isabelle A1 - Gélinas, Guillaume A1 - Marcet, Stéphane A1 - Dagar, Janardan A1 - Bartelt, Andreas A1 - Schlatmann, Rutger A1 - Unger, Eva A1 - Stegemann, Bert T1 - Hyperspectral Photoluminescence Imaging for Spatially Resolved Determination of Electrical Parameters of Laser‐Patterned Perovskite Solar Cells JF - Solar RRL N2 - Absolute calibrated hyperspectral photoluminescence (PL) imaging is utilized to access, in a simple and fast way, the spatial distribution of relevant solar cell parameters such as quasi‐Fermi level splitting, optical diode factor, Urbach energies Eu, and shunt resistances Rsh, without the need for electrical measurements. Since these metrics play a significant role in evaluating the process windows for electrical series interconnection by laser patterning, this approach is followed to systematically locate and quantify electrical losses that may occur as a result of the laser‐patterning process for monolithic series interconnection. It is shown that both picosecond and nanosecond laser pulses can be used for successful series interconnection. In both cases, only minor lateral material alterations occur, localized in a few μm wide region adjacent to the edges of the scribe lines. Furthermore, the acquisition and analysis of these hyperspectral PL datasets provide insights in the material removal process, from which it is concluded that the perovskite is rather resilient against the thermal impact of the laser. KW - Laserablation KW - ablation KW - hyperspectral photoluminescence KW - lasers KW - perovskites KW - photovoltaics KW - solar modules KW - thin films KW - Laser KW - Perowskitgruppe KW - Fotovoltaik Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-18215 SN - 2367-198X VL - 7 IS - 22 PB - Wiley ER - TY - JOUR A1 - Fenske, Markus A1 - Schultz, Christof A1 - Dagar, Janardan A1 - Kosasih, Felix Utama A1 - Zeiser, Andreas A1 - Junghans, Cornelia A1 - Bartelt, Andreas A1 - Ducati, Caterina A1 - Schlatmann, Rutger A1 - Unger, Eva A1 - Stegemann, Bert T1 - Improved Electrical Performance of Perovskite Photovoltaic Mini‐Modules through Controlled PbI2 Formation Using Nanosecond Laser Pulses for P3 Patterning JF - Energy Technology N2 - The upscaling of perovskite solar cells to modules requires the patterning of the layer stack in individual cells that are monolithically interconnected in series. This interconnection scheme is composed of three lines, P1–P3, which are scribed using a pulsed laser beam. The P3 scribe is intended to isolate the back contact layer of neighboring cells, but is often affected by undesired effects such as back contact delamination, flaking, and poor electrical isolation. Herein, the influence of the laser pulse duration on the electrical and compositional properties of P3 scribe lines is investigated. The results show that both nanosecond and picosecond laser pulses are suitable for P3 patterning, with the nanosecond pulses leading to a higher open circuit voltage, a higher fill factor, and a higher power conversion efficiency. It is found that the longer pulse duration resultes in a larger amount of PbI2 formed within the P3 line and a thin Br‐rich interfacial layer which both effectively passivate defects at the scribe line edges and block charge carrier in its vicinity. Thus, nanosecond laser pulses are preferable for P3 patterning as they promote the formation of beneficial chemical phases, resulting in an improved photovoltaic performance. KW - Laserablation KW - ablation KW - laser KW - perovskites KW - photovoltaics KW - series interconnections KW - solar modules KW - thin films KW - Laser KW - Perowskit KW - Fotovoltaik Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-15841 VL - 9 IS - 4 SP - 1 EP - 8 ER -