I don't read a lot of teeny types, but for scifi, I still liked The Uglies Trilogy. It's by Scott Westerfeld, and I probably liked it because I'm a sucker for post-apocalyptic scenarios. So, I had also read Hunger Games, and Read Player One.
Speaking of Ready Player One, it would be another recommendation. They got a movie deal, so that'll be out... who knows when.
I bought, but haven't read yet, Heinlein's Starship Troopers, which is supposed to be really good (compared to the movie) scifi.
Depending on your e-reader, you might be able to get graphic novels... I'd see if Sky Doll is available, it is an amazing scifi comic (I could only find one issue in English since it is a French comic) with sexiness in it. As well as Saga, another good one issue scifi comic.
Wings by Julie Gonzales. Excellent book with an excellent theme. By far, the best book I've read. Okay, maybe it's competing with Artemis Fowl. And Eragon. And Everlost.... Okay, never mind. But read it. And you might as well read the other ones.
And my best friend would reccomend Atlas Shrugged and The Fountainhead by Ayn Rayn. I think that's her name.
hmm... destroyermen is an awesome series. At first it's all like "What? This is so stupid" but by the third book, i loved absolutely every aspect of the story. I've still got to get my hands on the last book.