Perovskite solar cells (PSCs) are considered to be one of the most promising solar energy
harvesters owing to their high power conversion efficiency (PCE). To increase their PCE
even further, additives are used; however, some of these additives pose certain
disadvantages, which limit their applications to PSCs. Therefore, in this study, the nature‐
inspired ecofriendly M13 bacteriophage is genetically engineered to maximize its
performance as a perovskite crystal growth template and as a passivator for PSCs. The …

In article number 2101221, Jin-Woo Oh, Hyung Do Kim, Il Jeon, and co-workers report
genetic modification of M13 bacteriophages to amplify amino acid K, which functions as a
perovskite growth template and a stronger passivator than the wild-type virus in PSCs. The
modified virus-added perovskite solar cells exhibited a higher efficiency of 23.6% than the
wild-type counterparts (22.8%). The observed enhancement is attributed to slightly larger
perovskite grains and strong grain boundary passivation. The obtained device efficiency has …