<i>P</i> - and <i>N</i> -type InAs nanocrystals with innately controlled semiconductor polarity
J. Yoon, Hyoin Kim, Meeree Kim, Hwichan Cho, Yonghyun Albert Kwon, Mahnmin Choi, Seongmin Park, Tae‐Wan Kim, Seunghan Lee, Hyunwoo Jo, BongSoo Kim, Jeong Ho Cho, Ji‐Sang Park, Sohee Jeong, Moon Sung Kang
Abstract
InAs semiconductor nanocrystals (NCs) exhibit intriguing electrical/optoelectronic properties suitable for next-generation electronic devices. Although there is a need for both n - and p -type semiconductors in such devices, InAs NCs typically exhibit only n -type characteristics. Here, we report InAs NCs with controlled semiconductor polarity. Both p - and n -type InAs NCs can be achieved from the same indium chloride and aminoarsine precursors but by using two different reducing agents, diethylzinc for p -type and diisobutylaluminum hydride for n -type NCs, respectively. This is the first instance of semiconductor polarity control achieved at the synthesis level for InAs NCs and the entire semiconductor nanocrystal systems. Comparable field-effective mobilities for holes (3.3 × 10 −3 cm 2 /V·s) and electrons (3.9 × 10 −3 cm 2 /V·s) are achieved from the respective NC films. The mobility values allow the successful fabrication of complementary logic circuits, including NOT, NOR, and NAND comprising photopatterned p - and n -channels based on InAs NCs.