Omnivision application US20100176276 promises to reduce image lag and increase full well in 4T BSI pixels.
The prior art straight transfer gate pixel has maximum potential in area A, while B potential is lower, creating a potential barrier and image lag:
Peninsula transfer gate reaches the area A, so the barrier and the lag are reduced:
One other interesting note is that the inventor is located in Hiroshima, Japan. So far, I did not know that Omnivsion has a pixel design group there.