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Organic electron‐transporting materials (ETMs) with low‐temperature solution processability and high electron‐transfer/transport characteristics have received significant attention for their use in high‐performance perovskite solar cells (PSCs). In contrast to widely investigated fullerene‐based organic ETMs for PSCs, only a few types of non‐fullerene‐based ETMs have been developed. In this Concept article, a representative design concept for non‐fullerene ETMs is described for use in normal (n‐i‐p) and inverted (p‐i‐n) type PSCs. On the basis of a discussion on ETM requirements for PSCs, recently developed non‐fullerene polymeric and small‐molecule‐based ETMs for PSCs are highlighted, alongside various other approaches for enhancing PSC device performance, such as using additional dopants and introducing amine terminal groups in the ETMs and ETM‐based interlayers. This Concept provides a basic design concept for non‐fullerene‐based ETMs in PSCs. A place in the sun: This Concept article describes the representative design concept of non‐fullerene organic electron‐transporting materials (ETMs) for normal‐ and inverted‐structured perovskite solar cells (PSCs). A discussion of the requirements of ETMs for PSCs is also discussed (HTM=hole‐transporting material; TCO=transparent conducting oxide). [ABSTRACT FROM AUTHOR]

The Front Cover shows high performance perovskite solar cells (PSCs) based on non‐fullerene organic electron transporting materials (ETMs). Organic ETMs are very attractive for high performance PSCs due to their efficient electron transporting characteristics and low‐temperature solution processability. In their Concept, S.‐K. Jung, D. S. Lee et al. discuss representative design concepts of non‐fullerene polymeric and small molecular‐based ETMs for normal and inverted PSCs and their ETM requirements. More information can be found in the Concept by S.‐K. Jung, D. S. Lee et al. on page 3882 in Issue 22, 2018 (DOI: 10.1002/cssc.201801908). [ABSTRACT FROM AUTHOR]

Invited for this month′s cover is the collaborative team of the groups of O‐Pil Kwon and Jong H. Kim at Ajou University and Sang Hyuk Im at Korea University. The image shows non‐fullerene organic electron transporting materials for perovskite solar cells. The Concept itself is available at 10.1002/cssc.201801908. "ETMs are very attractive for PSCs..." This and more about the story behind the research that inspired the Cover image is presented in the Cover Profile. Read the full text of the corresponding article at 10.1002/cssc.201801908. View the Front Cover here: 10.1002/cssc.201802623. [ABSTRACT FROM AUTHOR]