Wearable Tin‐Based Perovskite Solar Cells Achieved by a Crystallographic Size Effect

Abstract

Tin‐based perovskite solar cells (PSCs) demonstrate a potential application in wearable electronics due to its hypotoxicity. However, poor crystal quality is still the bottleneck for achieving high‐performance flexible devices. In this work, graphite phase‐C3N4 (g‐C3N4) is applied into tin‐based perovskite as a crystalline template, which delays crystallization via a size‐effect and passivates defects simultaneously. The double hydrogen bond between g‐C3N4 and formamidine cation can optimize lattice matching and passivation. Moreover, the two‐dimensional network structure of g‐C3N4 can fit on the crystals, resulting an enhanced hydrophobicity and oxidation resistance. Therefore, the flexible tin‐based PSCs with g‐C3N4 realize a stabilized power conversion efficiency (PCE) of 8.56 % with negligible hysteresis. In addition, the PSCs can maintain 91 % of the initial PCE after 1000 h under N2 environment and keep 92 % of their original PCE after 600 cycles at a curvature radius of 3 mm.

Environmentally friendly anti-solvent engineering for high-efficiency tin-based perovskite solar cells

“…3f), which means that HAc-treated perovskite films suffer low stress. 30 The results indicate that HAc-treated perovskite films exhibit low lattice distortion and higher crystal quality. In addition, such a slow crystal growth process may facilitate the preparation of high-uniformity perovskite films.…”

A shape memory scaffold for body temperature self‐repairing wearable perovskite solar cells with efficiency exceeding 21%

“…22,23 Recent reports have shown that the perovskite film fabricated by the solution method can inevitably generate residual strain owing to the difference in thermal expansion coefficient of the substrate and perovskite layer. 51,52 The residual strain is from the lattice distortion on the microscopic scale. Grazing incidence X-ray diffraction (GIXRD) measurement is used to discuss the strain in the perovskite film.…”

Organic Molecule Bifunctionalized Polymeric Carbon Nitride for Enhanced Photocatalytic Hydrogen Peroxide Production

“…[24] More interestingly, for Ar + ion etched MBCN-15, the peak of CÀ NH x in the C 1s spectrum and the peak of NÀ H x in the N 1s spectrum shifted toward lower and higher binding energies, respectively, confirming disappearance of the connection of benzene rings with the edge amino of melon because the Ar + ion etching removed the surface layer of MBCN-15. [25] In contrast, the other peaks had no obvious shift, indicating that the benzene rings were maintained between the melon chains. In the O 1s spectrum, the peak at 532.2 eV for all the samples were assigned to surficial À OH species.…”