Semiconductor memory device

A semiconductor memory device, comprising:

• a bit line extending in a first direction;
• a first word line and a second word line extending in a second direction perpendicular to the first direction;
• a channel pattern between the bit line and the first and second word lines, the channel pattern including:
• first and second vertical channel portions spaced apart from each other in a third direction, the third direction being inclined with respect to the first and second directions, and
• a horizontal channel portion connecting the first and second vertical channel portions to each other;
• and
• a gate insulating pattern between the first and second word lines and the channel pattern.

A semiconductor memory device, comprising:

• a peripheral circuit structure including:
• peripheral circuits on a semiconductor substrate, and
• a lower insulating layer covering the peripheral circuits;
• bit lines extending in a first direction on the peripheral circuit structure;
• a mold insulating pattern having trenches, the mold insulating pattern extending in a second direction to cross the bit lines;
• a first word line and a second word line in each of the trenches, the first word line and the second word line extending in the second direction to cross the bit lines;
• channel patterns between the bit lines and the first and second word lines, each of the channel patterns including:
• first and second vertical channel portions spaced apart from each other in a third direction, the third direction being inclined with respect to the first and second directions, and
• a horizontal channel portion connecting the first and second vertical channel portions to each other;
• a gate insulating pattern between the channel patterns and the first and second word lines, the gate insulating pattern extending in the second direction;
• landing pads connected to the first and second vertical channel portions of the channel patterns, respectively;
• and
• data storage patterns on the landing pads, respectively.