You can search full-text law reviews, limiting your results to those pertaining to ethics, in LexisNexis Academic (UC only). The source, Legal Ethics Law Review Articles, Combined, contains selected articles discussing legal ethics in the practice of law. Coverage varies by individual source.
Click on "Find" on the top right. In the keyword search box, enter "legal ethics law review articles" and click Find Sources. Select the source (there will only be one) and then click on OK - Continue (on the far right), which will turn red after you checkmark the box next to the source.