All-inorganic CsPbI 3 perovskite is emerging to be an alternative light-harvesting material in solar cells owing to the enhanced stability and comparable photovoltaic performance compared to organic−inorganic hybrid perovskites. However, the desirable black phase α-CsPbI 3 is not stable at room temperature and degrades rapidly to a nonperovskite yellow phase δ-CsPbI 3 . Herein, we introduce a compositional engineering approach via incorporating Bi 3+ in CsPbI 3 to stabilize the α-phase at room temperature. Fully inorganic solar cells based on the Bi-incorporated α-CsPb 1−x Bi x I 3 compounds demonstrate a high PCE of 13.21% at an optimal condition (incorporation of 4 mol % Bi 3+ ) and maintain 68% of the initial PCE for 168 h under ambient conditions without encapsulation. This is the first attempt of partial substitution of the "B"-site of the perovskite to stabilize the α-CsPbI 3 , which paves the way for further developments of such perovskites and other optoelectronic devices.O rganic−inorganic halide perovskite materials have attracted tremendous research interest owing to their intriguing optical characteristics as well as promising application in next-generation optoelectronic devices. 1−6 Among the various hybrid halide perovskites, CH 3 NH 3 PbI 3 (MAPbI 3 ) and HC(NH 2 ) 2 PbI 3 (FAPbI 3 ) have been frequently studied and have achieved power conversion efficiencies (PCEs) exceeding 20% in solar cells. 7−15 However, due to the hygroscopicity and thermally unstable nature of organic cation MA + , MAPbI 3 is thermally unstable and vulnerable to moisture. 16−20 Even for the more thermostable FAPbI 3 , the presence of hygroscopic FA + also makes it suffer from the moisture stability issue. 8,21−23 In order to improve the stability and photovoltaic performance of the devices, a series of Cs-incorporated systems have been developed, 24−34 such as Cs x MA 1−x PbI 3 , 24 Cs x FA 1−x PbI 3 , 27,28,30 FA 0.83 Cs 0.17 Pb-(I 1−x Br x ) 3 , 31 and Cs x (MA 0.17 FA 0.83 ) 1−x Pb(I 0.83 Br 0.17 ) 3 . 29,32 However, these Cs-incorporated systems still face big challenges for the long-term stability due to the remaining organic components.Recently, all-inorganic cesium lead halide perovskites (CsPbX 3 ) are emerging to be alternative light-harvesting materials in solar cells and have exhibited excellent ability to resist moisture and heat. 35−39 Nevertheless, CsPbBr 3 has a very large band gap of 2.3 eV, which is unable to absorb light with long-range wavelengths and usually results in low PCE of the solar cells. 38−40 Compared to CsPbBr 3 , black phase α-CsPbI 3 (Figure 1a) has a more suitable band gap of 1.73 eV for solar

Magic organic clusters, representing well-defined zero-dimensional organic clusters with identical sizes and configurations, have received increased interests in recent years. Previously, the magic clusters were mainly stabilized through van der Waals force, C–H...π interaction, hydrogen bonding, dipole interaction, etc., which yet lack thermal stability and tunable electronic transport properties for potential applications. The introduction of metal adatoms into the organic systems would be an excellent choice for facilitating more stable magic clusters as the metal adatoms could serve as a nucleation center and help for clustering of organic ligands with increased stabilities. Considering the limited coordination number of metal species, it would be of great interest to introduce multilevel interactions besides metal–organic bonding, which may provide new avenues for controllable fabrication of more complicated and larger magic clusters. Herein, we have achieved the controllable fabrication of three distinct magic metal–organic clusters, especially two hierarchical ones with different sizes on the reconstructed Au(111) and unreconstructed Ag(111) surface. The key for various unprecedented magic hierarchical clusters here is the selection of the organic ligands with only one active carboxyl (−COOH) group which possesses bonding flexibility and diversity features after dehydrogenation but avoids the usual two-dimensional network of those containing more −COOH groups.

Hexacene was synthesized at the single molecule level and macroscopic scale, respectively. The film mobility of hexacene was observed at 0.123 cm2 V−1 s−1.

Polycyclic aromatic compounds (naphthalene, anthracene and pyrene) have been intercalated into the superstructures of fullerene nanowhiskers, using a facile liquid-liquid interfacial precipitation (LLIP) method. Due to the interaction between polycyclic molecules and fullerene, the growth of fullerene crystals was interfered in comparison to the fullerene crystal growth without the polycyclic molecules, resulting in the formation of fullerene superstructures with various nanofeatures. Moreover, the fluorescence emissions of the fullerene superstructures were significantly changed due to the intercalation of the polycyclic molecules, implying the influence of molecular packing on the electron transfer within the nanostructures. These results may bring new insights on the control of fullerene nanostructures and to manipulate their optical properties in optoelectronic devices.

Chiral molecular self‐assemblies were usually achieved using short‐range intermolecular interactions, such as hydrogen‐, metal–organic, and covalent bonding. However, unavoidable surface defects, such as step edges, surface reconstructions, or site dislocations may limit the applicability of short‐range chirality recognition. Long‐range chirality recognition on surfaces would be an appealing but challenging strategy for chiral reservation across surface defects at long distances. Now, long‐range chirality recognition is presented between neighboring 3‐bromo‐naphthalen‐2‐ol (BNOL) stripes on an inert Au(111) surface across the herringbone reconstruction as investigated by STM and DFT calculations. The key to achieving such recognition is the herringbone reconstruction‐induced local dipole accumulation at the edges of the BNOL stripes. The neighboring stripes are then forced to adopt the same chirality to create the opposite edged dipoles and neutralize the neighbored dipole moments.