Exhibit 3.1

CERTIFICATE OF INCORPORATION

OF

CHARDAN HEALTHCARE ACQUISITION 5 CORP.

THE UNDERSIGNED, for the purpose of incorporating and organizing a corporation under the General Corporation Law of the State of Delaware, does hereby execute this Certificate of Incorporation and does hereby certify as follows:

FIRST: The name of the corporation is Chardan Healthcare Acquisition 5 Corp. (hereinafter called the "Corporation").

SECOND: The registered office of the Corporation is to be located at 28 Old Rudnick Lane, in the City of Dover, in the County of Kent, Delaware 19901. The name of its registered agent at that address is Corp1, Inc.

THIRD: The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of Delaware.

FOURTH: The name and mailing address of the incorporator is: Jaszick Maldonado, c/o Loeb & Loeb LLP, 345 Park Avenue, New York NY 10154.

FIFTH: The total number of shares which the Corporation shall have authority to issue is five million (5,000,000) shares of common stock, $0.0001 par value.

SIXTH: A Director of the Corporation shall not be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a Director of the Corporation, except to the extent that exculpation from liability is not permitted under the General Corporation Law of the State of Delaware as in effect at the time such liability is determined. No amendment or repeal of this paragraph shall apply to or have any effect on the liability or alleged liability of any Director of the Corporation for or with respect to any acts or omissions of such Director occurring

SEVENTH: In furtherance and not in imitation of the powers conferred by statute, the Board of Directors of the Corporation is expressly authorized to make, alter or repeal the By-Laws of the Corporation; provided, however, that no By-Laws hereafter adopted by the Board of Directors or stockholders shall invalidate any prior act of the Directors which would have been valid if such By-Laws had not been adopted.

EIGHTH: The Corporation shall, to the maximum extent permitted from time to time under the law of the State of Delaware, indemnify and upon request advance expenses to any person who is or was a party or is threatened to be made a party to any threatened, pending or completed action, suit, proceeding or claim, whether civil, criminal, administrative or investigative, by reason of the fact that such person is or was or has agreed to be a Director or officer of the Corporation or while a Director or officer is or was serving at the request of the Corporation as a director, officer, partner, trustee, employee or agent of any corporation, partnership, joint venture, trust or other enterprise, including service with respect to employee benefit plans, against expenses (including attorneys’ fees and expenses), judgments, fines, penalties and amounts paid in settlement incurred (and not otherwise recovered) in connection with the investigation, preparation to defend or defense of such action, suit, proceeding or claim; provided, however, that the foregoing shall not require the Corporation to indemnify or advance expenses to any person in connection with any action, suit, proceeding, claim or counterclaim initiated by or on behalf of such person. Such indemnification shall not be exclusive of other indemnification rights arising under any By-Law, agreement, vote of Directors or stockholders or otherwise and shall inure to the benefits of the heirs and legal representatives of such person. Any person seeking indemnification under this paragraph shall be deemed to have met the standard of conduct required for such indemnification unless the contrary shall be established. Any repeal or modification of the foregoing provisions of this paragraph shall not adversely affect any right or protection of a Director or officer of the Corporation with respect to any acts or omissions of such Director or officer occurring prior to such repeal or modification.

NINTH: In furtherance of and not in limitation of powers conferred by statute, it is further provided:

1. Election of Directors need not be by written ballot unless the By-Laws of the Corporation so provide.

2. Meetings of stockholders may be held within or without the State of Delaware, as the By Laws may provide.

3. To the extent permitted by law, the books of the Corporation may be kept outside the State of Delaware at such place or places as may be designated from time to time by the Board of Directors or in the By-Laws of the Corporation.

TENTH: Except as otherwise provided herein, the Corporation reserves the right to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon stockholders herein are granted subject to this reservation.

IN WITNESS WHEREOF, the undersigned, being the incorporator herein before named, has executed this Certificate of Incorporation this 18^th day of June, 2020.

CERTIFICATE OF AMENDMENT

OF

CERTIFICATE OF INCORPORATION

OF

CHARDAN HEALTHCARE ACQUISITION 5 CORP.

I, Jonas Grossman, being the President of Chardan Healthcare Acquisition 5 Corp., a corporation existing under the laws of the State of Delaware (the “Corporation”), do hereby certify as follows:

First. The name of the Corporation is: Chardan Healthcare Acquisition 5 Corp.

Second. The original Certificate of Incorporation of the Corporation was filed with the Secretary of State of the State of Delaware (the “Secretary”) on June 18, 2020 (the “Certificate of Incorporation”).

Third. The Certificate of Incorporation is hereby amended by striking Article FIRST thereof in its entirety and substituting in lieu thereof a new Article FIRST, which shall read in its entirety as follows:

“FIRST: The name of the corporation is: CleanTech Acquisition Corp. (the “Corporation”)”

Fourth. This Certificate of Amendment of Certificate of Incorporation has been duly adopted in accordance with the provisions of Section 242 of the Delaware General Corporation Law.

IN WITNESS WHEREOF, the undersigned affirms that the statements made herein are true under the penalties of perjury, this 15^th day of January, 2021.