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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">中国科学家发现神奇半导体材料 </h1> <p class="xg1"> 时间：2018-4-12 11:36<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(879)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=6492&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>柔软，甚至可折叠的柔性电子设备，比如柔性手机屏，甚至柔软的手机等，是很多人期待已久的新装备。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 中国科学院上海硅酸盐研究所史迅研究员、陈立东研究员与德国马普所的Yuri Grin教授等合作，率先发现了一种像金属一样“柔软”的<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">半导体</a><a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>：它是一种典型的半导体，但却具有非常反常的、和金属类似的力学性能——良好的延展性和可弯曲性，或可广泛应用于柔性<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>设备中。这一神奇材料的化学成分中含有银原子，为α-Ag2S。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201804/12/113605tnplpv3q22wxq2wi.jpg" target="_blank"><img src="data/attachment/portal/201804/12/113605tnplpv3q22wxq2wi.jpg"></a></p></div><div><br></div><div style="text-align: center;"> 原理图。神奇柔性半导体材料α-Ag2S</div><div><br></div><div> 相关研究论文4月9日在线发表在国际<a href="http://theory.oecr.com" target="_blank" class="relatedlink">学术</a>期刊《自然·材料学》杂志（Nature Materials）。</div><div><br></div><div> 长期以来，人们以为半导体材料都像陶瓷一样脆。但中国科学家最新发现的α-Ag2S材料，其性能令人惊讶。</div><div><br></div><div> 一般陶瓷和半导体的<a href="http://optics.oecr.com" target="_blank" class="relatedlink">加工</a>碎片则为细小颗粒或粉末，但α-Ag2S在外力和大应变下，也不会破碎。其材料的加工碎片和金属类似，是一片片细长的缠绕丝状物。</div><div><br></div><div> 近年来迅速发展的柔性电子材料，只是将有机/无机材料电子器件制作在柔性衬底上。即便如此，它们独特的可变形性以及高效、低成本制造<a href="http://optics.oecr.com" target="_blank" class="relatedlink">工艺</a>，在信息、能源、<a href="http://medicine.oecr.com" target="_blank" class="relatedlink">医疗</a>、国防等领域具有广泛应用前景。</div><div><br></div><div> 然而，目前的无机材料尤其是半导体均为脆性材料，在大弯曲和大变形下，或者拉伸状况下极易发生断裂进而导致器件失效；此外，有机半导体相对无机半导体迁移率较低，且电学性能可调范围较小，无法满足半导体工业的蓬勃发展需求。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201804/12/113635rew7mmzwgx21xru0.jpg" target="_blank"><img src="data/attachment/portal/201804/12/113635rew7mmzwgx21xru0.jpg"></a></p></div><div style="text-align: center;"><br></div><div style="text-align: center;"> 神奇半导体材料α-Ag2S。受访者供图</div><div><br></div><div> 针对柔性电子的应用，史迅等研究人员制备了α-Ag2S<a href="http://opticalfilm.oecr.com" target="_blank" class="relatedlink">薄膜</a>，它比块体材料具有更大地变形能力。而且，在数十、上百次弯曲后，其导电性能基本维持不变或变化很小。</div><div><br></div><div> 知其然，知其所以然。</div><div><br></div><div> 研究人员发现，在α-Ag2S变形、滑移过程中，2个S原子沿着6个Ag原子构成的滑轨移动，此时不断有旧的Ag-S键减弱甚至断裂，而又有新的Ag-S键加强甚至生成。因此，其滑移面之间的作用力一直维持在Ag-S的成键状态，其在滑移过程中能量波动较小，导致了小的滑移能量势垒；同时该成键状态保证了这些滑移面之间较强的作用力，避免了在滑移过程中裂纹的产生甚至材料的解离。</div><div><br></div><div> 这一性质与其他材料明显不同。金刚石材料在滑移过程中的势垒太大，所以，不存在滑移面，无法延展。而NaCl、石墨的滑移面之间的作用力太小，材料在滑移过程中很容易产生裂纹，从而解离，丧失完整性。</div><div><br></div><div> 研究人员表示，一个具有良好滑移能力和延展性的材料必需满足两个基本条件：一是存在能量势垒较小的滑移面，能够在外力的作用下发生滑动；二是在滑移过程中不发生分解，仍然维持材料的整体性、完整性。</div><div><br></div><div> 他们正在寻找其他类似于α-Ag2S的半导体材料。</div><div><br></div><div><p style="text-align: center;"><b><font size="5">欢迎关注OECR公众号</font></b></p><p 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