QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 23.3

CONSENT OF PRICEWATERHOUSECOOPERS LLP
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated March 5, 2004 relating to the financial statements, which appears in AXT, Inc.'s Annual Report on Form 10-K. We also consent to the reference to us under the heading "Experts" in such Registration Statement.

/s/ PRICEWATERHOUSECOOPERS LLP PricewaterhouseCoopers LLP

San Jose, California
December 14, 2006

QuickLinks

CONSENT OF PRICEWATERHOUSECOOPERS LLP INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM