科技工作者之家
科技工作者之家APP是专注科技人才,知识分享与人才交流的服务平台。
科技工作者之家 2020-04-23
来源:知社学术圈
海归学者发起的公益学术平台
分享信息,整合资源
交流学术,偶尔风月
体光伏效应是基本的光电转换效应之一,特指非中心对称材料中自发产生的光电流。与传统的半导体光伏效应不同,体光伏效应不受到Shockley–Queisser 极限的约束,可以实现更高的光电转换效率,因而在过去二十年得到广泛的关注。已有的体光伏效应研究集中于以钙钛矿氧化物为主的无机铁电材料,如BiFeO3、PbTiO3等。相比氧化物,有机材料具有价格低廉、易合成、带隙小且易调控等优势。前期相关研究已经在低温有机固体中发现了光伏效应,然而如何在更高温度,如室温下获得有机光伏响应仍是一个挑战。
该文近期发表于npj Computational Materials 6: 6 (2020),英文标题与摘要如下
Releasing the hidden shift current in the TTF-CA organic molecular solid via symmetry lowering
Bumseop Kim, Jeongwoo Kim, Dongbin Shin, Min Choi, Junhee Lee and Noejung Park,
Bulk photovoltaic effect, characterized by an excitation-driven unbiased spontaneous photocurrent, has attracted substantial attention mainly due to its potential for harvesting solar energy. Here, we investigate the photovoltaic characteristics of organic molecular solids and focus on the association between the photocurrent and the crystal symmetry in the exemplary case of etrathiafulvalene-p-chloranil. We perform comprehensive first-principles calculations, including direct evaluations of the excitedstate current via real-time propagations of the time-dependent density functional theory. We find that the charge shifting in the low-temperature phase is mainly driven by the intrachain ferroelectricity, which gives rise to a photocurrent not only in the visiblelight range but also near the band-edge infrared region. The shift current that is locked in the symmetry of the high-temperature phase can be released by introducing a potential asymmetry. We suggest that organic molecular solids can be exploited viaappropriate engineering to lower the symmetry, aiming at room-temperature photovoltaics.
来源:zhishexueshuquan 知社学术圈
原文链接:https://mp.weixin.qq.com/s?__biz=MzIwMjk1OTc2MA==&mid=2247502417&idx=3&sn=69d3f9c8d49e45ff31f0a733304b5b2b&chksm=96d434aea1a3bdb89bfe62b78595da28e82e207b6f5c0832c8aac758e3d633c1511d91172767#rd
版权声明:除非特别注明,本站所载内容来源于互联网、微信公众号等公开渠道,不代表本站观点,仅供参考、交流、公益传播之目的。转载的稿件版权归原作者或机构所有,如有侵权,请联系删除。
电话:(010)86409582
邮箱:kejie@scimall.org.cn
化学所在氯取代有机光伏材料设计方面取得系列进展
新型透明电极材料助推有机光伏技术走向市场
铁电反常光伏效应研究取得新进展----中国科学院
低成本有机光伏材料研究取得新进展
新型直接带隙光伏材料—让懒惰的He也干点实事
Advanced Materials:交流电光伏效应诞生
铁电反常光伏效应研究取得新进展
汉能与中科院设立“先进薄膜光伏联合实验室”
宋波:二维材料侧向光伏效应在位敏探测器的应用
效率13.46%,低成本有机光伏材料新进展