Integrated assemblies comprising conductive levels having two different metal-containing structures laterally adjacent one another, and methods of forming integrated assemblies

A method of forming an integrated assembly, comprising:

• forming a vertical stack of alternating first and second levels;
• the first levels comprising first material and the second levels comprising second material;
• forming an opening to extend through the stack;
• forming channel material within the opening;
• forming slits to extend through the stack, with the slits being laterally offset from the channel material;
• after forming the slits, removing the second material to leave voids;
• forming first conductive structures within the voids;
• the first conductive structures having proximal regions adjacent the channel material and having distal regions adjacent the slits;
• removing the distal regions to form cavities adjacent the proximal regions;
• and
• forming second conductive structures within the cavities and directly against the proximal regions of the first conductive structures;
• wherein the forming of the second conductive structures comprises:
• forming semiconductor material within the cavities;
• and
• replacing at least some of the semiconductor material with metal-containing material.

A method of forming an integrated assembly, comprising:

• forming conductive levels that alternate with insulative levels to form a stack;
• the forming the conductive levels comprising:
• forming first regions of the conductive levels by forming a conductive core material and forming a conductive liner material along upper and lower surfaces of the conductive core material;
• the conductive liner material being compositionally different from the conductive core material;
• and
• forming second regions of the conductive levels laterally adjacent the first regions, the second regions comprising a conductive rail having at least two portions laterally offset relative to one another, with one of the at least two portions having a first uniform composition along its total vertical thickness, and with another of the at least two portions having a second uniform composition, different from the first uniform composition, along its total vertical thickness.