For the high content of sp-hybridized carbon atoms, carbyne based materials can express superior conductivity and ultra-high theoretical capacity, which are key factors of high-performance anode. However, the poor stability of synthetic intermediates and unwanted side reactions lead to huge challenge to synthesis carbyne alternating carbon–carbon triple and single bonds. Here, we rationally designed a smart “Greedy Snake” strategy to synthesize the alkyne rich carbon materials named Si capped alkyne rich carbon (Si-Alkyne-C) which comprised of sp-hybridized carbon atoms. The as-prepared Si-Alkyne-C generated on the copper surface through a carbon–carbon coupling, in which Si can effectively protect the intermediates generated by the reaction. The C–Si bond can constantly generate copper-alkyne intermediates to couple with other terminal alkynes to continuously elongate like "Greedy Snake", forming a long alkyne chain structure. The as-prepared Si-Alkyne-C can be applied as anode electrodes, exhibited very high reversible capacity of up to 2776 mAh/g at a current density of 50 mA/g and an average capacity around 1202 mAh/g at a high current density of 5000 mA/g for 5000 cycles, which are the best results among the reported carbon materials and better than many other anode materials. These results not only provide a facile strategy to prepare carbyne based materials, but also open a broad avenue for the preparation of high-capacity anode materials.

The strong aggregation tendency of hole transport material poly[3-(4-carboxylbutyl) thiophene-K (P3CT-K) restricts its further application in inverted perovskite solar cells (PSCs). Here, we report an effective strategy to address this issue and achieve the superior performance of inverted methylammonium lead triiodide (MAPbI₃) PSCs, in which graphdiyne oxide (GDYO) doped P3CT-K nanocomposites are applied as the hole transport nanolayer (HTL). It is revealed that the strong π–π stacking interaction occurs between GDYO and P3CT-K, which is proved by the blue shift of the absorption peak of P3CT-K nanolayer. The aggregation control via GDYO contributes to the property improvement of P3CT-K HTL. Moreover, the homogeneous coverage induces the growth of perovskite grain with larger size than that based on the undoped one. As a result, the optimized surface morphology, enhanced conductivity, charge extraction as well as better crystal quality, finally improve the device performance. An optimal power conversion efficiency of 19.06% is achieved, with simultaneously improved fill factor and short circuit current density. This work presents the potential of functional graphdiyne (GDY) in the development of highly efficient photovoltaic device.