Chung Hyun Suk, Han Gill Sang, Park So Yeon, Shin Hee-Won, Ahn Tae Kyu, Jeong Sohee, Cho In Sun, Jung Hyun Suk
∇Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
§Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea.
ACS Appl Mater Interfaces. 2015 May 20;7(19):10324-30. doi: 10.1021/acsami.5b00948. Epub 2015 May 8.
We report on the direct growth of anatase TiO2 nanorod arrays (A-NRs) on transparent conducting oxide (TCO) substrates that can be directly applied to various photovoltaic devices via a seed layer mediated epitaxial growth using a facile low-temperature hydrothermal method. We found that the crystallinity of the seed layer and the addition of an amine functional group play crucial roles in the A-NR growth process. The A-NRs exhibit a pure anatase phase with a high crystallinity and preferred growth orientation in the [001] direction. Importantly, for depleted heterojunction solar cells (TiO2/PbS), the A-NRs improve both electron transport and injection properties, thereby largely increasing the short-circuit current density and doubling their efficiency compared to TiO2 nanoparticle-based solar cells.
我们报道了通过一种简便的低温水热法，利用种子层介导的外延生长，在透明导电氧化物（TCO）衬底上直接生长锐钛矿型TiO₂纳米棒阵列（A-NRs），该方法可直接应用于各种光伏器件。我们发现种子层的结晶度和胺官能团的添加在A-NR生长过程中起着关键作用。A-NRs呈现出具有高结晶度的纯锐钛矿相，且在[001]方向上具有择优生长取向。重要的是，对于耗尽型异质结太阳能电池（TiO₂/PbS），A-NRs改善了电子传输和注入性能，从而大幅提高了短路电流密度，与基于TiO₂纳米颗粒的太阳能电池相比，其效率提高了一倍。
