The research field on perovskite solar cells (PSCs) is seeing frequent record breaking in the power conversion efficiency (PCE). However, organic-inorganic hybrid halide perovskites and organic additives in common hole-transport materials (HTMs) exhibit poor stability against moisture and heat. Here we report the successful fabrication of all-inorganic PSCs without any labile or expensive organic components. The entire fabrication process can be operated in ambient environment without humidity control (e.g., a glovebox). Even without encapsulation, the all-inorganic PSCs present no performance degradation in humid air (90-95% relative humidity, 25 °C) for over 3 months (2640 h) and can endure extreme temperatures (100 and -22 °C). Moreover, by elimination of expensive HTMs and noble-metal electrodes, the cost was significantly reduced. The highest PCE of the first-generation all-inorganic PSCs reached 6.7%. This study opens the door for next-generation PSCs with long-term stability under harsh conditions, making practical application of PSCs a real possibility.

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An efficient method to synthesize well-crystallized inorganic cesium lead halide perovskites (CsPbX, X = I or Br) with high yield and high reproducibility was proposed. Notably, the as-prepared CsPbI in the yellow orthorhombic phase (y-CsPbI) can be easily converted to the black cubic perovskite phase CsPbI (b-CsPbI) after thermal annealing. Furthermore, two-terminal photodetectors and all-inorganic perovskite solar cells based on b-CsPbI were fabricated, exhibiting high performances.

An integrated perovskite solar capacitor combining a perovskite solar cell and a supercapacitor is developed.

Nanometre scale interfacial layers between the metal cathode and the n-type semiconductor play a critical role in enhancing the transport of charge carriers in and out of optoelectronic devices. Here, a range of nanoscale alkali and alkaline earth metal carbonates (i.e., potassium, rubidium, caesium, calcium, strontium, and barium) are shown to function effectively as electron heterocontacts to lightly doped n-type crystalline silicon (c-Si), which is particularly challenging to contact with

Figure 3. (a) J−V plot of CsPbBr 3 /carbon-based all-inorganic PSCs. The inset shows the corresponding photovoltaic parameters. (b) Statistical histogram of the PCEs of 40 individual CsPbBr 3 / carbon-based all-inorganic PSCs. (c) Normalized PCEs of CsPbBr 3 / carbon-based all-inorganic PSCs and MAPbI 3 /carbon-based and MAPbI 3 /spiro-MeOTAD-based hybrid PSCs as a function of storage time in humid air (90−95% RH, 25°C) without encapsulation. (d) Normalized PCEs of CsPbBr 3 /carbon-based all-inorganic PSCs and MAPbI 3 /carbon-based hybrid PSCs as a function of time heated at high temperature (100°C) in a high-humidity ambient environment (90−95% RH, 25°C) without encapsulation. (e) Normalized PCEs of CsPbBr 3 /carbon-based all-inorganic PSCs vs storage time during temperature cycles (between −22 and 100°C) in a high-humidity ambient environment (90−95% RH, 25°C) without encapsulation.Figure 4. (a) J−V plots of an all-inorganic PSC with a large active area of 1.0 cm 2 measured in the forward and reverse scanning modes. (b) IPCE spectrum and integrated current density of the PSC in (a). Addition/Correction pubs.acs.org/JACS

Chiral organic polymers have considerable potential in solution-processable circularly polarized organic light emitting diodes (CP-OLEDs) due to features simple, low cost and large-area processing. Achiral conjugated poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]-thiadiazol-4,8-diyl)] (F8BT) is a...

Chirality of 1,1′-binaphthol (BINOL) is due to the restricted rotation between two naphthalene rings, and its skeletal structure of binaphthyl unit can be further modified by choosing functionalized substituents to afford the enlarged chiral induction effect. In this paper, we designed and synthesized nine chiral binaphthyl derivatives ( R/S-1–R/S-9) as circularly polarized electroluminescence (CP-EL) inducers by inserting various bridged alkyl chains into the hydroxyl groups of BINOL or introducing functionalized substituents with different steric hindrances on the 3,3′-position of 2,2′-methylenedioxy-1,1′-binaphthalene. Their molecular conformations and CPL behaviors of nine chiral inducers were significantly dependent on the length of the alkyl chain and the degree of substituent steric hindrance, which could further regulate their chiral induction effect on achiral fluorescent polymer F8BT from small to large in the doped films. Moreover, in virtue of the planar rigid conjugated molecular conformation of R/S-1, R/S-6, and R/S-9, the amplified CPL signals (|g PL|) were detected as high as 2.36 × 10–2, 2.06 × 10–2, and 1.26 × 10–2 from blends of F8BT and these chiral inducers. The circularly polarized organic light-emitting diode (CP-OLED) device on the blends of F8BT and chiral inducers ( R/S-6) with small dihedron angle and excellent carrier mobility showed a low turn-on voltage (V on < 4.5 V), high brightness (> 10509.6 cd/m2), and maximum |g EL| value of 1.86 × 10–2 (F8BT + 5% R/S-6). This work can develop and provide a valuable reference for CP-OLED device design through chiral dopant induction.