This week, the ratings of 8 Semiconductors & Semiconductor Equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

First Solar, Inc. (FSLR) is having a tough week. The company’s rating falls from a D to a F. First Solar, Inc. designs and manufactures solar modules. The company also gets F’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of FSLR stock.

Slipping from a C to a D rating, ON Semiconductor Corporation (ON) takes a hit this week. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ON stock.

Photronics, Inc. (PLAB) gets weaker ratings this week as last week’s C drops to a D. Photronics, Inc. manufactures photomasks, which are high precision quartz plates that contain microscopic images of electronic circuits. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PLAB stock.

CVD Equipment Corporation (CVV) declines this week from a D to a F. CVD Equipment Corporation develops, manufactures, and markets chemical vapor deposition equipment, annealing furnaces, and etching systems. The company also gets F’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CVV stock.

JA Solar Holdings Co., Ltd. Sponsored ADR (JASO) experiences a ratings drop this week, going from last week’s D to a F. JA Solar Holdings Co., Ltd. Sponsored ADR is engaged in the design, manufacture, and marketing of high-performance solar cells, which are made from specially processed silicon wafers. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of JASO stock.

This is a rough week for Yingli Green Energy Holding Co. Ltd. Sponsored ADR (YGE). The company’s rating falls to F from the previous week’s D. Yingli Green Energy Holding Co. Ltd. Sponsored ADR designs, manufactures and sells photovoltaic modules, and designs, assembles, sells and installs photovoltaic systems. The company also gets F’s in sales growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of YGE stock.

This week, Sunworks, Inc. (SUNW) drops from a C to a D rating. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SUNW stock.

This week, Kopin Corporation’s (KOPN) rating worsens to a F from the company’s D rating a week ago. Kopin Corporation develops and manufactures semiconductor materials and small form factor displays. The company also gets F’s in sales growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of KOPN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.