The integration of perovskite quantum dots (PQDs) with polymers has emerged as one of the effective strategies to enhance environmental stability of PQDs and broaden their application prospects. However, inherent phase separation between PQDs and polymers, along with poor dispersion, remains critical obstacles limiting the application of perovskite-polymer composites. In this work, we introduce a strategy for one-step in situ polymerization to construct PQDs-polybutyl acrylate (PBA) gels through photoinduced electron/energy transfer-reversible addition-fragmentation chain transfer polymerization initiated by polymerizable PQDs. Through silanized hydrolysis treatment, methylammonium lead bromide (MAPbBr₃) QDs were successfully encapsulated with SiO₂ and functionalized with surface-grafted C=C bonds. The introduced C=C bonds enable covalent bonding between PQDs and the polymer matrix, achieving uniform dispersion of PQDs in the polymer matrix. The high catalytic efficiency of polymerizable PQDs achieves an 86% conversion rate for 6 h. By adjusting the loadings of polymerizable PQDs, we successfully prepared PQDs-PBA gels with tunable mechanical properties. Furthermore, the gels retain over 90% of their initial photoluminescence (PL) intensity after 30 days of exposure to ambient environment and water immersion, while maintaining satisfactory PL intensity under harsh conditions. The PQDs-PBA gels exhibit outstanding tensile and bending properties, demonstrating promising potential for applications in optical functional materials.

Metal halide perovskite solar cells (PSCs) are anticipated to play a pivotal role in the next generation of photovoltaic technologies, but their unsatisfactory stability hinders further commercial applications. Particularly, numerous interfacial defects and poor mechanical adhesion at the perovskite buried interface present a critical obstacle hindering power conversion efficiency (PCE) and long-term stability of PSCs. Here, different from conventional small-molecule or linear polymer interface modifiers, we introduce a star-shaped PMMA-b-PDMAEMA (S-MD, where PMMA = poly(methyl methacrylate) and PDMAEMA = poly(dimethylaminoethyl methacrylate)) polymer as a multifunctional bridge-linking polymer for simultaneous defect passivation and mechanical reinforcement at the buried interface of inverted (p–i–n) PSCs. S-MD features a three-dimensional architecture with multiple extended conjugated arms, offering multiple Lewis base functional groups (e.g., C=O and R–N(CH₃)₂) with a high density of multidentate coordination sites. These groups can effectively coordinate with electron-deficient defects at the perovskite buried interface, enabling improved crystallization, reduced defect density, and enhanced interfacial adhesion. As a result, the interfacial fracture strength increases from 0.13 to 1.66 MPa. The resultant device achieves a PCE of 26.35% (certified steady-state PCE of 25.96%). The flexible device retains over 90% of its initial efficiency after 3000 flexing cycles at a curvature radius of 6 mm (R = 6 mm). This work highlights a multidentate coordinating, star-shaped polymer interface strategy that offers a promising pathway toward highly efficient and stable inverted PSCs.