@article{ghasemi_guo_darabi_wang_wang_huang_lefler_taussig_chauhan_baucom_et al._2023, title={A multiscale ion diffusion framework sheds light on the diffusion-stability-hysteresis nexus in metal halide perovskites}, ISSN={["1476-4660"]}, DOI={10.1038/s41563-023-01488-2}, abstractNote={Stability and current-voltage hysteresis stand as major obstacles to the commercialization of metal halide perovskites. Both phenomena have been associated with ion migration, with anecdotal evidence that stable devices yield low hysteresis. However, the underlying mechanisms of the complex stability-hysteresis link remain elusive. Here we present a multiscale diffusion framework that describes vacancy-mediated halide diffusion in polycrystalline metal halide perovskites, differentiating fast grain boundary diffusivity from volume diffusivity that is two to four orders of magnitude slower. Our results reveal an inverse relationship between the activation energies of grain boundary and volume diffusions, such that stable metal halide perovskites exhibiting smaller volume diffusivities are associated with larger grain boundary diffusivities and reduced hysteresis. The elucidation of multiscale halide diffusion in metal halide perovskites reveals complex inner couplings between ion migration in the volume of grains versus grain boundaries, which in turn can predict the stability and hysteresis of metal halide perovskites, providing a clearer path to addressing the outstanding challenges of the field.}, journal={NATURE MATERIALS}, author={Ghasemi, Masoud and Guo, Boyu and Darabi, Kasra and Wang, Tonghui and Wang, Kai and Huang, Chiung-Wei and Lefler, Benjamin M. and Taussig, Laine and Chauhan, Mihirsinh and Baucom, Garrett and et al.}, year={2023}, month={Feb} } @article{park_wei_xu_atapattu_eickemeyer_darabi_grater_yang_liu_teale_et al._2023, title={Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells}, volume={381}, ISSN={["1095-9203"]}, DOI={10.1126/science.adi4107}, abstractNote={ Perovskite solar cells (PSCs) consisting of interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal of uniting performance with stability. However, as the field continues to seek ever-higher durability, additional tools that avoid progressive ligand intercalation are needed to minimize degradation at high temperatures. We used ammonium ligands that are nonreactive with the bulk of perovskites and investigated a library that varies ligand molecular structure systematically. We found that fluorinated aniliniums offer interfacial passivation and simultaneously minimize reactivity with perovskites. Using this approach, we report a certified quasi–steady-state power-conversion efficiency of 24.09% for inverted-structure PSCs. In an encapsulated device operating at 85°C and 50% relative humidity, we document a 1560-hour T 85 at maximum power point under 1-sun illumination. }, number={6654}, journal={SCIENCE}, author={Park, So Min and Wei, Mingyang and Xu, Jian and Atapattu, Harindi R. and Eickemeyer, Felix T. and Darabi, Kasra and Grater, Luke and Yang, Yi and Liu, Cheng and Teale, Sam and et al.}, year={2023}, month={Jul}, pages={209–215} } @article{comstock_chou_wang_wang_song_sklenar_amassian_zhang_lu_liu_et al._2023, title={Hybrid magnonics in hybrid perovskite antiferromagnets}, volume={14}, ISSN={["2041-1723"]}, url={https://doi.org/10.1038/s41467-023-37505-w}, DOI={10.1038/s41467-023-37505-w}, abstractNote={Abstract}, number={1}, journal={NATURE COMMUNICATIONS}, author={Comstock, Andrew H. and Chou, Chung-Tao and Wang, Zhiyu and Wang, Tonghui and Song, Ruyi and Sklenar, Joseph and Amassian, Aram and Zhang, Wei and Lu, Haipeng and Liu, Luqiao and et al.}, year={2023}, month={Apr} } @article{li_huang_mencke_kandappa_wang_ding_jiang_amassian_liao_thompson_et al._2023, title={Interactions between nonfullerene acceptors lead to unstable ternary organic photovoltaic cells}, volume={120}, ISSN={["1091-6490"]}, DOI={10.1073/pnas.2301118120}, abstractNote={For organic photovoltaic (OPV) devices to achieve consistent performance and long operational lifetimes, organic semiconductors must be processed with precise control over their purity, composition, and structure. This is particularly important for high volume solar cell manufacturing where control of materials quality has a direct impact on yield and cost. Ternary-blend OPVs containing two acceptor–donor–acceptor (A–D–A)-type nonfullerene acceptors (NFAs) and a donor have proven to be an effective strategy to improve solar spectral coverage and reduce energy losses beyond that of binary-blend OPVs. Here, we show that the purity of such a ternary is compromised during blending to form a homogeneously mixed bulk heterojunction thin film. We find that the impurities originate from end-capping C=C/C=C exchange reactions of A–D–A-type NFAs, and that their presence influences both device reproducibility and long-term reliability. The end-capping exchange results in generation of up to four impurity constituents with strong dipolar character that interfere with the photoinduced charge transfer process, leading to reduced charge generation efficiency, morphological instabilities, and an increased vulnerability to photodegradation. As a consequence, the OPV efficiency falls to less than 65% of its initial value within 265 h when exposed to up to 10 suns intensity illumination. We propose potential molecular design strategies critical to enhancing the reproducibility as well as reliability of ternary OPVs by avoiding end-capping reactions.}, number={23}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Li, Yongxi and Huang, Xinjing and Mencke, Austin R. and Kandappa, Sunil Kumar and Wang, Tonghui and Ding, Kan and Jiang, Zuo-Quan and Amassian, Aram and Liao, Liang-Sheng and Thompson, Mark E. and et al.}, year={2023}, month={Jun} } @article{wang_li_ardekani_serrano-lujan_wang_ramezani_wilmington_chauhan_epps_darabi_et al._2023, title={Sustainable materials acceleration platform reveals stable and efficient wide-bandgap metal halide perovskite alloys}, volume={6}, ISSN={["2590-2385"]}, DOI={10.1016/j.matt.2023.06.040}, abstractNote={