EXHIBIT 10.1

SECURITIES PURCHASE AGREEMENT

THIS SECURITIES PURCHASE AGREEMENT (the “Agreement”) is entered into as of June 27, 2008 (the “Effective Date”), by and between The Quercus Trust (“Buyer”) and Emcore Corporation, a New Jersey Corporation ( “Seller”).

RECITALS

WHEREAS, Seller desires to sell to Buyer that certain number shares of Series D Convertible Preferred Stock (the “Shares”) and warrants to purchase additional shares of Series D Preferred Stock (the “Warrants”, and together with the Shares, the “Securities”) of WorldWater & Solar Technologies Corp., a Delaware corporation (the “Company”), and Buyer desires to purchase such Securities from Seller, all in accordance with the terms and conditions set forth in this Agreement.

AGREEMENT

NOW, THEREFORE, in consideration of the mutual promises contained herein, the parties hereto agree as follows:

1.Sale of Securities.

1.1 First Closing.  Seller hereby agrees to sell to Buyer, and Buyer hereby agrees to purchase from Seller, 1,000,000 Shares of Series D Convertible Preferred and 100,000 Warrants to purchase Shares of Series D Convertible Preferred for an aggregate purchase price of $6,540,000.

1.2Second Closing.  At the second closing (the “Second Closing”) which shall be no later than July 31, 2008, Seller hereby agrees to sell to Buyer, and Buyer hereby agrees to purchase from Seller, 1,000,000 Shares of Series D Convertible Preferred and 100,000 Warrants to purchase Series D Convertible Preferred for an aggregate purchase price of $6,540,000.

2.Deliverables.

2.1At each Closing, Buyer will deliver to Seller the purchase price paid by cash, check or wire transfer. The purchase price will constitute the entire consideration to be paid by Buyer to Seller for the Shares purchased at the applicable Closing.

2.2Within three (3) days after each Closing, or such other time as the parties agree, Buyer will (a) deliver to the Company’s transfer agent (the “Transfer Agent”) a stock power (the “Stock Power”), in the form attached hereto as Exhibit A, in respect of the Shares owned by Seller, fully endorsed for transfer to Buyer; and (b) deliver to the Company, or the Company’s transfer agent, as applicable, a Warrant Assignment assigning the Warrants to Buyer.  Seller has, or will have, prior to each Closing, delivered to the Transfer Agent the original stock certificate and warrant certificate which include the Securities to be sold to Buyer.  Pursuant to the terms of this Agreement, Seller shall request that, upon the Transfer Agent’s receipt of such Stock Power and Warrant Assignment, the Transfer Agent shall (1) issue and deliver to Buyer a duly executed stock certificate representing the total number of Shares transferred to Buyer in the agreement, (2) issue and deliver to Buyer a duly executed warrant certificate representing the total number of Warrants transferred to Buyer in the agreement, and (3) issue and deliver to Seller duly executed stock certificate(s) and warrant certificate(s) representing the balance of the Shares and Warrants owned by Seller after the Effective Date.

3.Seller’s Representations. Seller represents and warrants to Buyer and the Company as follows:

3.1Seller owns the Securities beneficially and of record, free and clear of any suit, proceeding, call, voting trust, proxy, restriction, security interest, lien or other encumbrance of any kind or nature whatsoever (collectively, a “Lien”) and has full power, authority and capacity to transfer and dispose of all the Securities free and clear of any Lien. Upon the payment for and delivery of the Securities as provided in this Agreement, Buyer will acquire good and valid title to the Securities free and clear of any Lien.

3.2The execution and delivery of this Agreement by Seller, the consummation of the transaction contemplated hereby, and the compliance with the terms of this Agreement will not conflict with, result in the breach of, or constitute a default under, or require any consent or approval under, any agreement, note, indenture, mortgage, deed of trust or other agreement, lease or instrument to which either Seller is a party or by which it may be bound.

3.3No broker or finder has acted directly or indirectly for Seller in connection with this Agreement or the transaction contemplated hereby, and no broker or finder is entitled to any brokerage or finder’s fee or other commission in respect thereof based in any way on agreements, arrangements or understandings made by or on behalf of Seller.

3.4This Agreement has been duly authorized, executed and delivered by Seller and constitutes the legal, valid and binding obligation of Seller, enforceable against Seller in accordance with its terms.

3.5Seller’s transfer of the Securities to Buyer is exempt from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”) and any applicable state securities laws, in each case pursuant to applicable exemptions thereunder.

3.6Seller expressly acknowledges and agrees that the Company has made no representations or warranties in connection with the Securities or the transactions contemplated by this Agreement.

4.Buyer’s Representations. Buyer represents and warrants to Seller and the Company as follows:

4.1Buyer has full power and authority to purchase the Securities from Seller in accordance with this Agreement.

4.2Buyer understands that none of the Securities has been registered under the Securities Act. Buyer also understands that such Securities are being offered and sold pursuant to an exemption from registration contained in the Securities Act.

4.3The execution and delivery of this Agreement by Buyer, the consummation of the transaction contemplated herein, and the compliance with the terms of this Agreement will not conflict with, result in the breach of, or constitute a default under, or require any consent or approval under, any note, indenture, mortgage, deed of trust or other agreement, lease or instrument to which Buyer is a party or by which he may be bound.

4.4No broker or finder has acted directly or indirectly for Buyer in connection with this Agreement or the transaction contemplated hereby, and no broker or finder is entitled to any brokerage or finder’s fee or other commission in respect thereof based in any way on agreements, arrangements or understandings made by or on behalf of Buyer.

4.5This Agreement has been duly authorized, executed and delivered by Buyer and constitutes the legal, valid and binding obligation of Buyer, enforceable against Buyer in accordance with its terms.

4.6Buyer is an “accredited investor,” as that term is defined in Regulation D adopted pursuant to the Act.

4.7Seller’s transfer of the Securities to Buyer is exempt from the registration requirements of the Securities Act and any applicable state securities laws, in each case pursuant to applicable exemptions thereunder.

4.8The Securities to be acquired by Buyer from Seller as contemplated hereunder are being acquired for Buyer’s own account and not with a view to, or intention of, distribution thereof in violation of the Securities Act or any applicable state securities laws, and the Securities will not be sold, transferred, pledged or otherwise disposed of by Buyer in contravention of the Securities Act or any applicable state securities laws or any provision of the charter, bylaws or any stockholders agreement of the Company.

4.9Buyer is sophisticated in financial matters as to be able to evaluate the risks and benefits of the investment in the Securities and make an informed investment decision.

4.10Buyer has had an opportunity to ask questions and receive answers concerning the Company and the Securities and has had full access to such other information concerning the Company and the Securities as Buyer has requested. Buyer has also reviewed or has had an opportunity to review such other documents and information regarding the Company and its business as requested by Buyer to Buyer’s satisfaction.

4.11Buyer understands that the Seller is relying and will rely on the information and representations with respect to Buyer set forth in this Agreement as to whether the transfer of the Securities to Buyer qualifies for an exemption from the registration requirements under the Securities Act, and Buyer confirms that all such information is true and correct as of the date hereof.

4.12Buyer understands that Buyer must bear the economic risk of his acquisition of the Securities for an indefinite period of time because (1) the acquisition of Securities by Buyer has not been registered under the Securities Act or applicable state securities laws; and (2) the Securities may therefore not be sold, transferred, pledged, or otherwise disposed of unless registered for sale under the Securities Act, or unless pursuant to an applicable exemption from registration, and in any event only if the transfer is permitted. Buyer further acknowledges that an important consideration bearing on his ability to bear the economic risk of his acquisition of Securities is whether Buyer can afford a complete loss of such investment in the Company, and Buyer confirms that Buyer can afford a complete loss of such investment in the Company.

4.13Buyer understands that the certificates evidencing the Securities will bear one or more restrictive legends prohibiting the transfer thereof except in compliance with the applicable state and federal securities laws and with any restrictions on transfer contained in the Company’s bylaws and/or stockholders’ agreement, as in effect from time to time.

4.14Buyer expressly acknowledges and agrees that the Company has made no representations or warranties in connection with the Securities or the transactions contemplated by this Agreement.

5.Miscellaneous Provisions.

5.1Any number of counterparts of this Agreement may be signed and delivered and each will be considered an original and together they will constitute one agreement.

5.2This Agreement may not be amended or modified in any respect, except by the mutual written agreement of the parties hereto and the Company.

5.3Each party to this Agreement will pay its own expenses in connection with the transactions contemplated hereby, whether or not such transactions will be consummated.

5.4This Agreement will be construed and performed in accordance with the laws of the State of Delaware, without regard to the conflicts of law therein. The rights and liabilities of the present parties will bind and inure to their respective heirs, devisees, personal representatives, successors and assigns.

5.5This Agreement and the exhibits hereto constitute the entire agreement among the parties relating to their subject matter and supersede all prior and contemporaneous agreements and understandings of the parties in connection with such subject matter.

5.6From and after the date of this Agreement, upon the request of Seller, Buyer or the Company, Seller or Buyer, as applicable, will execute and deliver such instruments, documents or other writings as may be reasonably necessary or desirable to confirm and carry out and to effectuate fully the intent and purposes of this Agreement.

5.7The Company is an intended third party beneficiary of this Agreement and Buyer and Seller acknowledge and agree that the Company will rely and is intended to rely on the provisions, representations and agreements set forth herein. Other than the foregoing, nothing expressed or implied in this Agreement is intended, or shall be construed, to confer upon or give any person, firm, corporation, partnership, association or other entity, other than the parties hereto and the Company and their respective successors and assigns, any rights or remedies under or by reason of this Agreement.

IN WITNESS WHEREOF, the parties hereto have executed this Stock Purchase Agreement as of the date first written above.

BUYER:

The Quercus Trust

/s/ David Gelbaum

David Gelbaum, Trustee

SELLER:

EMCORE CORPORATION,

a New Jersey corporation

By:           /s/ Reuben Richards

Name:  Reuben Richards

Title:    Executive Chairman

EXHIBIT A

STOCK POWER

(Stock Assignment Separate From Certificate)

FOR VALUE RECEIVED, EMCORE CORPORATION, hereby sells, assigns and transfers unto THE QUERCUS TRUST One Million (1,000,000) shares of Series D Preferred Stock of WorldWater & Solar Technologies Corp., a Delaware corporation (the “Company”), standing in its name on the books of said Company, as represented by Certificate Nos. _________, and hereby irrevocably constitutes and appoints as Holder’s attorney to transfer the shares on the books of the Company, with full power of substitution in the premises.

Dated:  ___________________

EMCORE CORPORATION

____________________________

Name:  _____________________

Title:    _____________________

NOTE: The signature(s) to this assignment must correspond with the name as written upon the face of the certificate, in every particular, without alteration or enlargement, or any change whatsoever.