Front Cover: Solar RRL 2∕2017

The commercial manufacture of perovskite solar modules (PSM) suffers from stability concerns and scalability issues. Hu et al. (article No. 1600019) demonstrate a hole-conductor-free printable solar module embodiment which employs a triple layer of mesoporous TiO2/ZrO2/carbon as a scaffold, and is infiltrated by a mixed cation lead halide perovskite (5-AVA)x(MA)1-xPbI3 as a light harvester. Hole-conductor or Au reflector is not employed, but instead, the back contact is simply a printed carbon layer. Upon optimizing the thickness alignment of the triple mesoscopic layer and the design of the active area, the low-cost hole-conductor free, printable mesoscopic perovskite solar cell with carbon counter electrode has been successfully up-scaled to 100 cm2 and achieved a highest PCE of 10.4 %. A 7 m2 fully-printable perovskite solar panel is fabricated, showing reproducibility of screen-printing technique in manufacturing high-performance perovskite solar modules. Light-soaking stability of 1000 h has been demonstrated, as well as a local outdoor stability of one month and a shelf-life stability of over one year. This paves the way to realize efficient and stable large-area PSMs for industrial deployment.