今日Science: 钙钛矿材料特刊, Gratzel报道稳定效率超20%！

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美东时间2017年11月9日，Science杂志推出钙钛矿材料特刊，Special Issue: Perovskites，刊登了5篇论文，分别介绍了自然与人工合成钙钛矿材料的发展，钙钛矿太阳能电池的机遇与挑战，钙钛矿纳米晶在光电器件中的应用，以及钙钛矿在催化领域的应用。

同期Science还发表了Gratzel组一篇研究论文，报道以CuSCN为空穴传输层的钙钛矿太阳能电池稳定效率超过20%。

Perovskite solar cells (PSCs) with efficiencies greater than 20% have been realized only with expensive organic hole-transporting materials. We demonstrate PSCs that achieve stabilized efficiencies exceeding 20% with copper(I) thiocyanate (CuSCN) as the hole extraction layer. A fast solvent removal method enabled the creation of compact, highly conformal CuSCN layers that facilitate rapid carrier extraction and collection. The PSCs showed high thermal stability under long-term heating, although their operational stability was poor. This instability originated from potential-induced degradation of the CuSCN/Au contact. The addition of a conductive reduced graphene oxide spacer layer between CuSCN and gold allowed PSCs to retain >95% of their initial efficiency after aging at a maximum power point for 1000 hours under full solar intensity at 60°C. Under both continuous full-sun illumination and thermal stress, CuSCN-based devices surpassed the stability of spiro-OMeTAD–based PSCs.

钙钛矿可谓材料科学的多面明星，在铁电压电、超导、巨磁阻、固态电解质、以及太阳能电池等诸多领域都独领风骚，性能优异。中国学者在这些领域做了大量的出生工作。遗憾的是，这次没有中国本土学者参与特刊。

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