Do I have to have a sponsor for a marriage-based green card as an international Ph.D. student who is working as a researcher?

Hi, I am an international Ph.D. student in the US (F1 visa). I am a graduate research assistant meaning my tuition is paid by my advisor, and I also get a salary of $1632 (after tax) each month. My wife is a US citizen, and I am going to apply for the marriage-based green card. I was wondering if I still need a sponsor for the process? or Do I need to fill out the Declaration of Self-Sufficiency (i944 form)? I would appreciate it if you could help me with this question.